Items tagged “ct”
313 results found
Case
Intracerebral hemorrhage
Published
12 Feb 2018
95% complete
CT
Case
Aortic origin of the left vertebral artery
Published
30 Mar 2018
50% complete
CT
Case
Chilaiditi syndrome
Published
30 Apr 2018
89% complete
CT
X-ray
Case
Osteogenesis imperfecta
Published
14 May 2018
95% complete
CT
Article
CT fluoroscopy
Computed tomography (CT) fluoroscopy combines the conventional advantages of both CT and fluoroscopy and has an important role in image-guided interventions where real-time imaging is required.
Historically, fluoroscopy was the main image guidance tool for interventional radiology procedures. T...
Article
Image reconstruction in CT fluoroscopy
Image reconstruction in CT fluoroscopy requires the computer to provide very fast reconstructions of images in order to provide immediate and accurate spatial and anatomical feedback during a procedure. This is achieved by:
use of a small reconstruction matrix – e.g. 256 x 256 (compared with co...
Article
Radiation dose considerations in CT fluoroscopy
Consideration needs to be made to the radiation dose to both the patient and radiologist in CT fluoroscopy, given the relatively high and continuous radiation exposure involved.
Radiation exposure to the patient
The patient surface dosage may range between 2 and 10 mGy/sec, with exposure times...
Case
Pulmonary embolism - Westermark and Fleischner signs
Published
17 Nov 2018
95% complete
X-ray
CT
Case
Pericallosal lipoma
Published
12 Dec 2018
74% complete
CT
Case
Normal crystalline lens on CT
Published
05 Jan 2019
50% complete
CT
Case
CT metal artifact reduction - single energy metal artifact reduction (SEMAR) algorithm
Published
17 Apr 2019
58% complete
CT
Case
Intracranial dermoid cyst - ruptured
Published
05 Jun 2019
84% complete
CT
MRI
Article
Kernel (image reconstruction for CT)
The kernel, also known as a convolution algorithm, refers to the process used to modify the frequency contents of projection data prior to back projection during image reconstruction in a CT scanner 1. This process corrects the image by reducing blurring 1. The kernel affects the appearance of i...
Case
Craniofacial fibrous dysplasia
Published
27 Dec 2019
77% complete
CT
Article
Cone beam effect
Cone beam effect artifacts are seen in multidetector row CT (cone beam CT) acquisitions 1. Modern CT scanners use more detector arrays to increase the number of sections acquired per rotation. This causes the x-ray beams to become cone-shaped as opposed to fan-shaped 2. As a result instead of co...
Article
Arthrogram (MRI)
An MR arthrogram is an MRI performed after a joint is injected with a solution containing gadolinium. Sometimes abbreviated to MRA, which can be confused with MR angiography. MRI can also be performed after an injection is not directly administered into the joint, via an indirect arthrogram. An ...
Case
Intraosseous pneumatocyst
Published
25 Mar 2020
95% complete
CT
Case
Cervical transforaminal epidural steroid injection (CT-guided)
Published
20 Mar 2020
68% complete
CT
Case
Cervical transforaminal epidural steroid injection (CT-guided)
Published
21 Mar 2020
62% complete
CT
Case
Cervical transforaminal epidural steroid injection (CT-guided)
Published
22 Mar 2020
65% complete
CT
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