Articles

Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.

275 results found
Article

20° oblique projection

20° oblique projection is a troubleshooting projection used in mammography, especially in young women and in follow-up patients. Technique The C-arm is turned approximately 20° for a superomedial-inferolateral oblique. With the patient's feet pointing towards the unit and her torso turned slig...
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Abdomen (AP supine view)

AP supine radiograph can be performed as a standalone projection or as part of an acute abdominal series, depending on the clinical question posed, local protocol and the availability of other imaging modalities. Patient position the patient is supine, lying on their back, either on the X-ray ...
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Abdomen (dorsal decubitus view)

The dorsal decubitus view is a supplementary projection often replacing the lateral decubitus view in the context of an unstable patient who is unable to roll nor stand. Used to identify free intraperitoneal gas (pneumoperitoneum). It can be performed when the patient is unable to be transferred...
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Abdomen (lateral decubitus view)

The lateral decubitus abdominal radiograph is used to identify free intraperitoneal gas (pneumoperitoneum). It can be performed when the patient is unable to be transferred to, or other imaging modalities (e.g. CT) are not available. The most useful position for detecting free intraperitoneal ai...
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Abdomen (oblique view)

AP oblique supine radiograph is normally performed when localising foreign bodies or lines within the abdominal cavity. Additionally, the oblique abdominal series can be utilised in the assessment of the upper intestinal tract during barium studies. Patient position the patient is laying 30 de...
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Abdomen (PA erect view)

The PA erect abdominal radiograph is often obtained in conjunction with the AP supine abdominal view in the acute abdominal series of radiographs. When used together it is a valuable projection in assessing air fluid levels, and free air in the abdominal cavity. The erect abdominal radiograph h...
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Abdomen (PA prone view)

PA prone radiograph is rarely performed, often utilised when a patient is unable to lay supine. The projection is adequate for the examination of the abdominal cavities, however, not as practical for the renal structures due to magnification. Patient position the patient is prone, either on th...
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Abdominal radiograph (AP supine view neonatal)

AP supine radiograph for neonates is a mobile examination performed on the neonatal unit. It can be taken as a standalone projection or as part of a series including a left lateral decubitus x-ray in cases of suspected perforation.  Patient position the patient is supine, lying on their back i...
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Abdominal radiography

Abdominal radiography can be useful in many settings. Before the advent of computed tomography (CT) imaging, it was a primary means of investigating gastrointestinal pathology and often allowed indirect evaluation of other abdominal viscera. Indications Although abdominal radiography has lower...
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ABER position

The ABER position relates to MR arthrography of the shoulder joint and is a mnemonic for ABduction and External Rotation. In this position, labral tears are made conspicuous by tightening the inferior glenohumeral labroligamentous complex (which are also the most important glenohumeral ligament...
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Acromioclavicular joint (AP view)

The acromioclavicular AP view is single projection assessing the patency of the acromioclavicular joint. See also, acromioclavicular joint injuries. Patient position patient is erect midcoronal plane of the patient is parallel to the image receptor, in other words, the patient's back is agai...
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Acromioclavicular joint (AP weight-bearing view)

The acromioclavicular AP weight-bearing view is and additional interjection often performed to rule out displacement when it is suspected yet not confirmed on the AP view See also, acromioclavicular joint injuries. Patient position the patient is erect holding a weight in the affected sides h...
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Acromioclavicular joint series

The acromioclavicular (AC) joint radiographic series is a used to evaluate the acromioclavicular joint and the distal clavicle. Indications AC radiographs are performed for a variety of indications including:  shoulder trauma direct blows to the should region following a fall onto adducted ...
Article

Acute abdominal series

The acute abdominal series is a common set of abdominal radiographs obtained to evaluate bowel gas.  Indications The acute series is used for a variety of indications including:  determine the amount of bowel gas, with possible bowel distention assess air-fluid levels query pneumoperitoneum...
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ADIR position

The ADIR (ADduction and Internal Rotation) position relates to MR arthrography of the shoulder joint. When added to a neutral-position shoulder protocol, MR arthrography in the ADIR position facilitates the diagnosis of labroligamentous lesions in patients with recurrent shoulder dislocations, ...
Article

Air gap technique (mammography)

The air gap technique is utilised for the magnification mammography view. Magnification mammography is a high dose imaging technique which is generally utilised as a follow-up to a standard mammogram image series when a focal area needs to be more clearly examined 1. The air gap technique is ut...
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Air gap technique (plain radiography)

The utilisation of the air gap technique in general radiography is limited due to the need for equipment facilitation to create the air gap when it is not inherent in the standard technique. Horizontal-beam lateral hip There are many different methods of performing the horizontal beam lateral ...
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Aliasing artifact (CT)

Aliasing artifact, otherwise known as undersampling, in CT refers to an error in the accuracy proponent of analogue to digital converter (ADC) during image digitisation.  Image digitisation has three distinct steps: scanning, sampling, and quantization.  When sampling, the brightness of each p...
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Anatomic position

The anatomic position, also referred to as the standard anatomic position, is the consistent position of the human body in which positional reference is made for anatomical nomenclature. It is not reliant on whether the patient is standing, supine, prone, sitting, etc. The position is defined a...
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Ankle and foot radiography

Ankle and foot radiography is the plain radiographic investigation of the distal tibia and fibula, the tarsal bones and metatarsals. Radiographic examination of the foot and ankle are often requested together, however, there is a plethora of literature to aid in the correct request of x-ray exam...
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Ankle (AP view)

Ankle AP view is part of a three view series of the distal tibia, distal fibula, proximal talus and proximal metatarsals. Patient position the patient may be supine or sitting upright with their leg straighten on the table the foot is in dorsiflexion the toes will be pointing directly toward...
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Ankle (horizontal beam lateral view)

The ankle horizontal beam lateral view is a modified lateral view part of a three view ankle series; this projection is used to assess the distal tibia and fibula, talus, navicular, cuboid, the base of the 5th metatarsal and calcaneus. The horizontal beam lateral is a highly adaptable projectio...
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Ankle (lateral view)

Ankle lateral view is part of a three view ankle series; this projection is used to assess the distal tibia and fibula, talus, navicular, cuboid, the base of the 5th metatarsal and calcaneus. Patient position patient is in a lateral recumbent position on the table the lateral aspect of the kn...
Article

Ankle (mortise view)

Ankle AP mortise view is part of a three view series of the distal tibia, distal fibula, talus and proximal metatarsals. It is the most pertinent projection for assessing the articulation of the tibial plafond and two malleoli with the talar dome, otherwise known as the mortise joint of the ankl...
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Ankle series

The ankle series is comprised of an anteroposterior (AP), mortise and lateral radiograph. The series is often used in emergency departments to evaluate the distal tibia, distal fibula, and the talus; forming the ankle joint. See approach to an ankle series. Indications Ankle radiographs are p...
Article

Axillary view

An axillary view (also known as a "Cleopatra view“) is a type of supplementary mammographic view. It is an exaggerated craniocaudal view for better imaging of the lateral portion of the breast to the axillary tail. This projection is performed whenever we want to show a lesion seen only in the a...
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Baumann angle

Baumann angle, also known as the humeral-capitellar angle, is used for the evaluation of the displacement of  paediatric supracondylar humeral fractures. It is measured on a frontal radiograph, with elbow in extension. This angle is formed  by the humeral axis and a straight line through the ep...
Article

Beam hardening

Beam hardening is observed when an X-ray beam comprised of polychromatic energies passes through an object and becomes ‘harder’ as the lower energy photons will be absorbed leaving only the higher energy photons 1. The resultant artifact has two distinct appearances, streaking or dark bands and...
Article

Bouchard node

Bouchard nodes are a clinical sign relating to bony nodules of the the proximal interphalangeal joints, and are much less common than Heberden nodes. They generally (but not always) correspond to palpable osteophytes. Clinical presentation They are sometimes painful, and are typically associat...
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Bullseye view

The bullseye view is designed for better evaluation of lesion located in retroareolar area. In this view, the nipple-areola complex are directed upward or downward on the detector surface to visualize the areolar and periareolar region en face,  allowing characterization of lesions in this area.
Article

Calcaneus (axial view)

Calcaneus axial view is part of the two view calcaneus series, this projection is best used to asses the talocalcaneal joint and plantar aspects of the calcaneus. The axial view has a diagnostic sensitivity of 87% for calcaneus fractures 1.  Patient position patient is supine or seated with th...
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Calcaneus (lateral view)

Calcaneus lateral view is part of the two view calcaneus series; this projection is used to assess the calcaneus, talocrural, talonavicular and talocalcaneal joint. Patient position the patient is in a lateral recumbent position on the table the lateral aspect of the knee and ankle joint shou...
Article

Calcaneus series

The calcaneus series is comprised of a lateral and axial (plantodorsal) projection. The calcaneus is the most commonly fractured tarsal bone accounting for ~60% of all tarsal fractures 1. This series provides a two view investigation of the calcaneus alongside the talar articulations and talocal...
Article

Cardiac blood pool scan

A multi-gated (MUGA) cardiac blood scan scan is a common study performed in patients who are receiving potentially cardiotoxic chemotherapy.  Indications acute myocardial infarction (AMI) coronary artery disease (CAD) evaluation after coronary artery bypass graft surgery cardiomyopathy / my...
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Cardiac imaging planes

Cardiac imaging planes are used to orientate imaging in cardiac MRI, and are reconstructed for cardiac CT. There are three main planes, which are centred on a line (using body imaging planes) from the cardiac apex to the middle of the mitral valve, that is the true long axis of the heart 1,2:  ...
Article

Cassette

Cassettes are rigid holders used in conventional and computed radiography (CR) for the screen film system and imaging plate respectively.  The back side of the cassette has a rubber or felt for adequate contact between screen film system or with the imaging plate. The front is made of low atomi...
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Caudal cranial projection

Caudal cranial projection is an additional trouble shooting view. Technique invert the C arm as for a CC projection step the patient forward and have her bend excessively forward at the waist to ensure that the abdomen does not encroach in the x ray field place the image receptor above the b...
Article

Cerebral angiography

Cerebral angiography is an interventional procedure for the diagnosis and/or treatment of intracranial pathology. Indications Cerebral digital subtraction angiography (DSA) is indicated in a variety of settings including: diagnosis and treatment of: aneurysms acute ischaemic stroke vascula...
Article

Cervical spine (AP oblique view)

The AP oblique cervical spine projections are supplementary views to the standard AP, odontoid and lateral c-spine series. It can be taken either as an anterior oblique or posterior oblique projection. Patient position patient is standing erect with either the left or right posterior side clos...
Article

Cervical spine (AP view)

The AP cervical spine projection is part of the cervical spine series. Patient position patient positioned erect in AP position unless trauma the patient will be supine patient’s shoulders should be at equal distances from the image receptor to avoid rotation, the head facing straight forward...
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Cervical spine (Fuchs view)

The closed mouth odontoid AP view (Fuchs view)​ is a nonangled AP radiograph of C1 and C2. This view focuses primarily on the odontoid process. The standard Fuchs view should not be used in a trauma setting and the modified Fuchs view may be used instead. Patient position patient is supine or ...
Article

Cervical spine (PA oblique view)

The PA oblique cervical spine projections are supplementary views to the standard AP, Odontoid and lateral c-spine series. It can be taken either as an anterior oblique or posterior oblique projection. This projection can be used to visualise the intervertebral foramina. Patient position patie...
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Cervical spine (swimmer's lateral view)

Cervical spine swimmer's lateral view is a modified lateral projection of the cervical spine to visualise the C7/T1 junction. It is most often performed in the setting of trauma, where a standard lateral projection cannot image the cervicothoracic junction. As technology advances, computed tomo...
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Chest (AP erect view)

The erect anteroposterior chest view is the alternative to the PA view when the patient is too unwell to tolerate standing or leaving the bed 1. The AP view examines the lungs, bony thoracic cavity mediastinum and great vessels. This particular chest X-ray is often used frequently to aid diagnos...
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Chest (AP lordotic view)

The AP lordotic chest radiograph (or AP axial chest radiograph) demonstrates areas of the lung apices that appear obscured on the PA/AP chest radiographic views. It is often used to evaluate suspicious areas within the lung apices that appeared obscured by overlying soft tissue, upper ribs or th...
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Chest (expiratory view)

An expiratory chest radiograph can be taken in either a PA or AP projection, and can also be taken with a mobile/portable unit. They are used to help detect small pneumothoraces (although sensitivity is not increased over inspiratory chest radiographs 1), and to assess for inhaled foreign bodies...
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Chest (lateral decubitus view)

The lateral decubitus view of the chest is a specialised projection utilised to demonstrate small pleural effusions, or for the investigation of pneumothorax and air trapping due to inhaled foreign bodies. Patient position the patient is laying either left lateral or right lateral on a trolley...
Article

Chest (lateral view)

The lateral chest view is part of a common radiological investigation of the chest in the emergency department 1. The lateral chest view examines the lungs, bony thoracic cavity, mediastinum and great vessels.  Although the PA chest view is the primary view in chest imaging, the lateral radiogr...
Article

Chest (PA view)

Posteroanterior (PA) chest view is the most common radiological investigation in the emergency department 1. The PA view examines the lungs, bony thoracic cavity, mediastinum and great vessels. The chest X-ray is frequently used to aid diagnosis of acute and chronic conditions.   Patient positi...
Article

Chest radiograph

The chest radiograph (CXR) is the most ubiquitous radiological investigation. Indications The chest radiograph is performed for a broad content of indications, including but not limited to 1-4: respiratory disease cardiac disease haemoptysis   suspected pulmonary embolism investigation of...
Article

Chest (supine view)

The supine anteroposterior chest view is the alternative to the PA view and the AP erect view when the patient is generally too unwell to tolerate standing leaving the bed, or sitting 1. The supine view examines the lungs, bony thoracic cavity mediastinum and great vessels. This particular ches...
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Clavicle (AP cephalic view)

The clavicle AP cephalic angulation view is a standard projection part of the clavicle series. Often used in conjunction with the AP clavicle, this projection straightens out the clavicle and projects it above overlaying anatomy. Patient position patient is preferably erect midcoronal plane o...
Article

Clavicle (AP view)

The clavicle AP view is a standard projection part of the clavicle series. The projection demonstrates the shoulder in its natural anatomical position allowing for adequate radiographic examination of the entire clavicle, as well as the acromioclavicular and sternoclavicular joints of the should...
Article

Clavicle series

The radiographic series of the clavicle is utilised in emergency departments to assess the clavicle, acromioclavicular and sternoclavicular joint.   Indications Clavicle x-rays are indicated for a variety of settings including: trauma bony tenderness suspected fracture  congenital abnormal...
Article

Cleavage view

A cleavage view (also called "valley view") is a mammogram view that depict the posteromedial portion of both breasts (the “valley” between the two breasts) by placing them on the cassette at the same time and pulling them anteriorly.  Manual technical factors should be used. A cleavage view m...
Article

Coccyx (AP view)

The coccyx AP view is used to demonstrate the coccyx, in conjunction with the sacrum and coccyx (lateral view). Follow departmental protocol in relation to imaging this region.  Patient position the radiograph is performed with the patient in a supine position, with arms placed comfortably by ...
Article

Computed bone maturity (bone age) measurement

Computed bone age measurement refers to the automatic computer analysis of a left hand radiograph in order to estimate accurately bone age in cases of suspected growth delay.  Function Advanced digital processing of data from automatic computer analysis of the phalangeal/carpal bones and/ or e...
Article

Computed radiography

Computed radiography (CR) is the use of photostimulable phosphor as an image receptor. The image receptor is held in a similar casing (cassette) to that of the traditional film screen. CR harnesses the absorption of radiation, trapping electrons at energy levels via the process of photostimulabl...
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Computed tomography curriculum

The radiography computed tomography section covers in detail the various clinical presentations that require specific computed tomography investigations, the anatomy examined and the different protocols utilised for specific pathology. It is broken down into region specific sections and is cater...
Article

Contrast enhanced mammography

Contrast enhanced mammography (CEM) is a complementary breast imaging modality. A finite number of sequential images are obtained with X-ray beam produced at a high energy, above the K-edge of Iodine, and with an intravenous non-ionic Iodine contrast agent  injected between pre and post contrast...
Article

Contrast media extravasation

Contrast media extravasation (CMEV) refers to the leakage of contrast media from the normal intravascular compartment into surrounding soft tissues; It is a well-known complication of contrast-enhanced CT scanning. It can also occur in MRI studies, but the complications are rare given the low vo...
Article

Craniocaudal view

The craniocaudal view (CC view), along with the MLO view, is one of the two standard projections in a screening mammography. It must show the medial part as well the external lateral portion of the breast as much as possible. A correctly performed CC projection may show the pectoral muscle on t...
Article

CT abdomen (summary)

CT abdomen is an increasingly common investigation that is used to help make diagnoses of a broad range of pathologies. A CT abdomen in its simplest form is a CT from diaphragm to symphysis performed 60 seconds after pump-injection of iodinated contrast intro a peripheral vein. However, dependin...
Article

CT head (summary)

CT head is a standard test performed in the assessment of a heterogeneous group of patients who present with a wide variety of symptoms. CT is particularly useful because it is widely available and relatively easy to perform. It allows rapid assessment and diagnosis of a wide gamut of conditions...
Article

CT head (technique)

CT head technique describes how a CT head is performed. Technique The technique for performing a CT of the head depends on the scanner available and fall into two broad camps:  step-and-shoot volumetric acquisition (most common) Step-and-shoot Step-and-shoot scanning was the first describe...
Article

CT polytrauma (technique)

CT polytrauma/multitrauma (also called trauma CT) is an increasingly used test in the patient with multiple injuries sustained after significant trauma. There is some evidence that trauma patients who undergo whole body CT (WBCT) / panscan have better survival than patients who undergo selectiv...
Article

Dacryocystography

Dacryocystography is fluoroscopic contrast examination of the nasolacrimal apparatus. The duct is cannulated enabling contrast to be instilled into the nasolacrimal system. Indications The most frequent indication is epiphoria: tearing or watering of the eyes. Technique Equipment is similar ...
Article

Developer solution

Developer solution is used in dark room for developing (i.e. converting latent image to visible image) X-ray films used in conventional (screen film) radiography. Components developer: hydroquinone (for high contrast) + metal/phenidone (for low contrast) the developer itself gets oxidised and...
Article

Digital breast tomosynthesis

Digital breast tomosynthesis (DBT) is an imaging technique that allows a volumetric reconstruction of the whole breast from a finite number of low-dose two-dimensional projections obtained by different X-ray tube angles, with a geometric principle very similar to that applied in stratigraphic te...
Article

Digital image

A digital image is a numerical representation of an image via a set of picture elements known as pixels. This simplified article lists three parameters of a digital image that moderate resolution. Image matrix The image matrix comprised of columns (M) and rows (N) that define the elements or p...
Article

Digital Imaging and Communications in Medicine (DICOM)

Digital Imaging and Communications in Medicine (DICOM) is a worldwide standard for the storage and transmission of medical imaging. It has been developed with input from members of the DICOM standards committee, with representation from both manufacturers and users (including many American and E...
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Digital radiography

Digital radiography is based on the use of discrete values in comparison to conventional radiography which uses analogue/continuous values. It removes the requirement of dark room procedures. Types computed radiography (CR) uses photostimulable phosphor plates (PSP) in cassettes direct digit...
Article

Double spot compression view

A double spot compression view is obtained by focal compression of both sides of the breast to produce higher spatial and contrast resolution. This is made possible due to the increased amount of breast thinning and a significant decreased incidence of blurring because of decreased exposure time...
Article

Dual energy CT

Dual energy CT utilises two separate energy sets to examine the differing attenuation properties of matter, having a significant advantage over traditional single energy CT. Independent attenuation values at two energy sets can create virtual non-contrast images from contrast enhanced imaging as...
Article

Dual energy CT (clinical applications)

Dual-energy CT is becoming increasing more common in clinical practice due to the rapid rise in computer technology and expanding literature exhibiting vast advantages over conventional single energy CT.  Virtual non-contrast There is a potential to eliminate the need for pre-contrast imaging,...
Article

Dual-energy mammography

Dual-energy digital mammography is a complementary breast imaging modality. The technique consists of high-energy and low-energy digital mammograms after administration of iodinated contrast agent. Breast is exposed to low- and high-energy X-ray beams during a single breast compression in MLO ...
Article

Dual energy x-ray absorptiometry (DEXA)

Dual-energy x-ray absorptiometry (DEXA) is a technique used to aid in the diagnosis of osteopaenia and osteoporosis.  Radiographic features Values are calculated for the lumbar vertebrae and femur preferentially, and if one of those sites is not suitable (e.g. artifact, patient mobility, histo...
Article

Ectopic testis

Ectopic testes are a rare congenital anomaly, differing from undescended testis (cryptorchidism) in that ectopic testis is a congenitally abnormally located testis, that has descended from the abdominal cavity away from the normal path of descent while undescended testis are congenitally abnorma...
Article

Effect of isolated pronation-supination (lateral wrist radiograph)

The wrist series is comprised of a posteroanterior, oblique, and lateral projection. The series examines the carpal bones (namely, the scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate and hamate). It also examines the radiocarpal joint along with the distal radius and ulna....
Article

Eklund technique

Eklund modified compression technique  is a technique which can be used for patients with augmented or reconstructed breasts post mastectomy.  Technique It consists of postero-superior displacement of the implants simultaneously to an anterior traction of the breast, pushing the implants towar...
Article

Elbow (AP view)

The elbow AP view is part of the two view elbow series, examining the distal humerus, proximal radius and ulna.  The projection demonstrates the elbow joint in its natural anatomical position allowing for adequate radiographic examination of the articulations of the elbow including the radiohum...
Article

Elbow (Coyle's view)

The Coyle's view of the elbow is an axial projection that is performed in addition to the standard elbow series when there is suspicion of a radial head fracture 1-3. The projection isolates the radial head using a modified radiographic technique. Patient position patient is sitting next to th...
Article

Elbow (external oblique view)

The elbow external oblique view is an additional projection of the elbow often used to better demonstrate the radial head free from superposition. Patient position patient is seated alongside the table the fully extended arm and forearm, in a supinated position, are kept in contact with the t...
Article

Elbow (lateral view)

The lateral elbow view is part of the two view elbow series, examining the distal humerus, proximal radius and ulna. It is deceptively one of the more technically demanding projections in radiography 1-3. The projection is the orthogonal view of the AP elbow allowing for examination of the ulna...
Article

Elbow series

The elbow series is a set of radiographs taken to investigate elbow joint pathology, often in the context of trauma. It usually comprises an AP and lateral projection, although other non-standard, modified projections are utilised for specific indications. Indications Elbow x-rays are indicate...
Article

Elevated craniocaudal projection

Elevated craniocaudal projection is an additional trouble shooting view. Technique direct beam superiorly to inferiroly face patient towards unit, feet forward lean patient inward, relaxing the shoulders bring inferior aspect of breast onto the image receptor pull breast outward and forwar...
Article

Endovascular aneurysm sealing system (EVAS)

Endovascular aneurysm sealing system (EVAS) was developed with the intention to expand beyond the anatomic limitations of endovascular aneurysm repair (EVAR) devices, as well as to decrease the rates of re-intervention secondary to graft migration and type II endoleaks. EVAS was designed by End...
Article

Femoral torsion analysis

Femoral torsion analysis is used to assess the alignment of a femur post surgery. If one side has been operated on it can be compared to the non-operated side. Method Superimpose axial images of: femoral heads the neck of femurs femoral condyles Draw a line from the centre of the femoral h...
Article

Finger (oblique view)

Finger oblique view is a standard projection for radiographic assessment of the fingers. It is not required for follow-up studies for 'query Foreign Body' unless specifically requested. Patient position patient is seated alongside the table (similar to a projection of hand) from a pronated po...
Article

Finger (PA view)

Finger PA view is a standard projection for radiographic assessment of the fingers; it is one of three views of the finger series.  Patient position patient is seated alongside the table (similar to the projection of hand) palmar aspect of pronated hand is placed over detector and extended fi...
Article

Finger series

The finger series is comprised, conventionally of a posteroanterior, oblique and a lateral view. The series examines in detail the distal, middle and proximal phalanx as well as the interphalangeal, metacarpophalangeal and carpometacarpal joints.  Note: the thumb (first digit) reviewed under th...
Article

Fingers (lateral view)

Finger lateral view is a standard projection for radiographic assessment of the fingers; it is one of three views of the finger series. it is divided into: lateral index and middle fingers lateral of ring and little fingers Patient position Lateral of index and middle fingers patient seated...
Article

Flat panel CT

Flat panel computed tomography (FPCT), otherwise, know as flat panel volume tomography are multidetector computed tomography scanners that utilise a large area detector rather than a fixed array of detectors 1,3. Flat panels have a significantly wider z-axis area coverage that can cover larger ...

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