Items tagged “nuclear medicine”
55 results found
Superscan is intense symmetric activity in the bones with diminished renal and soft tissue activity on a Tc99m diphosphonate bone scan. This appearance can result from a range of aetiological factors: diffuse metastatic disease prostatic carcinoma breast cancer transitional cell carcinoma (...
Published 11 May 2010
Pelvi-ureteric junction obstruction
Pelvi-ureteric junction (PUJ) obstruction/stenosis, also known as ureteropelvic junction (UPJ) obstruction/stenosis, can be one of the causes of an obstructive uropathy. It can be congenital or acquired with a congenital PUJ obstruction being one of the commonest causes of antenatal hydronephros...
Graves disease is an autoimmune thyroid disease and is the most common cause of thyrotoxicosis (up to 85%). Epidemiology There a strong female predilection with the F:M ratio of at least 5:1. Typically presents in middle age. Clinical presentation Patients are thyrotoxic. Extra-thyroid manif...
Technetium agents based on the Technetium-99m (Tc-99m) radioisotope are frequently used agent in medical imaging. The radioactive technetium can be chelated to a number of different compounds to create specific radiopharmaceuticals and optimise imaging of various structures: Tc-99m ECD (ethyl c...
Alzheimer disease on SPECT
Published 29 Sep 2010
Calcaneal stress fracture
Published 20 Oct 2010
Radiopharmaceuticals are drugs that are bound to radioactive substances. The pharmaceutically active portion determines the activity that will be measured and the radioactive portion emits radiation that can be measured by the scanner. A number of radiopharmaceuticals are used in human imaging...
Tc-99m sulfur colloid
Technetium-99m sulfur colloid is one of the technetium radiopharmaceuticals. Characteristics photon energy: 140 keV physical half-life: 6 hours biological half-life normal distribution: liver: 85% spleen: 10% bone marrow: 5% excretion: hepatic target organ: liver, spleen pharmacokinet...
Xenon-133 is a radiopharmaceutical principally used when a performing VQ scan. Inhalation of this gas can also be used to assess cerebral blood flow. photon energy: 81 KeV physical half-life: 5.27 days biological half-life: 30 seconds normal distribution: lungs <15% of inhaled gas is absorb...
Iodine123 (I123) is a radioisotope of the element iodine (atomic number 53) used in nuclear medicine imaging including to scan the thyroid gland. Uses, dosages, and time of Imaging routine scan: 100-400 microCi po, image at 4-6 or 24 hours thyroid cancer scan: 1.5 mCi po, image at 4-6 or 24 ...
Thyroid scan (I-123)
Thyroid scan (thyroid scintigraphy) is a nuclear medicine examination used to evaluate thyroid tissue. Clinical indications functional status of a thyroid nodule thyrotoxicosis: differential diagnosis thyroid cancer whole body scan for distant metastases estimation of local residual thyro...
Tc-99m DMSA (dimercaptosuccinic acid) is a technetium radiopharmaceutical used in renal imaging to evaluate renal structure and morphology, particularly in paediatric imaging for detection of scarring and pyelonephritis. DMSA is an ideal agent for the assessment of renal cortex as it binds to th...
Tc-99m DTPA (diethylene-triamine-pentaacetate) is one of the technetium radiopharmaceuticals used in renal imaging. Characteristics photon energy: 140 KeV physical half-life: 6 hours biological half-life: 2.5 hours normal distribution: kidneys (100%) pharmacokinetics uptake by glomerular...
Renal artery stenosis caused by aortic dissection
Published 25 Jul 2011
PET-CT is a combination of cross-sectional anatomic information provided by CT and the metabolic information provided by positron emission tomography (PET). PET is most commonly performed with 2-[F-18]fluoro-2-deoxy-D-glucose (FDG). F-18 is an unstable radioisotope and has a half-life of approx...
Tc-99m MAG3 (mercaptoacetyltriglycine) is one of the technetium radiopharmaceuticals used in renal imaging. Characteristics photon energy: 140 KeV physical half life: 6 hours biological half life: 4 hours normal distribution: kidneys (100%) pharmacokinetics: uptake by tubular secretion (9...
Tc-99m pertechnetate is one of the technetium radiopharmaceuticals used in imaging of thyroid, colon, bladder and stomach. Characteristics photon energy: 140 keV physical half-life biological half-life: 6 hours normal distribution: stomach, thyroid, salivary glands, (testicles) excretion: ...
Thyroid scan (Tc-99m)
Tc-99m [pertechnetate] thyroid scan is a functional nuclear medicine study used to assess the thyroid gland. patient preparation fast for 4 hours prior to exam radiopharmaceutical Tc-99m pertechnetate dose and route of administration 3-5 mCi IV time of imaging 20 minutes after Tc-99m per...
Tc-99m HMPAO labelled WBC
Tc-99m HMPAO (hexamethylpropyleneamine oxime) labelled WBC is one of the technetium radiopharmaceuticals used in WBC imaging. Characteristics photon energy: 140 KeV physical half life: 6 hours biological half life: 4 hours normal distribution: spleen, liver, kidney, bone marrow pha...