Correlation between dose rate and T1 in blood at Gd-enhanced MR angiography
Creators
- 1. Uppsala Univ. Hospital (Sweden). Dept. of Diagnostic Radiology
Description
Purpose: To determine the correlation between dose rate and Tl in blood at Gd-enhanced MR angiography (MRA). Material and Methods: A test dose of contrast agent was used to calculate the time delay between injection and arrival in the abdominal aorta. The dose rate was expressed as ml x kg b.w.-1 x s-1. The correlation between dose rate and Tl was determined by varying the dose rate while keeping the scanning and infusion times constant. The signal intensity in the abdominal aorta was measured during the first pass of Gd and compared with markers of known Tl values. Results: A correlation between dose rate and Tl in blood was obtained. Conclusion: A Gd dose rate of 0.01 ml x kg b.w.-1 x s-1 gives a Tl in blood of 100 ms. This can be used to calculate the optimal pulse sequence for contrast-enhanced MRA. (orig.)
Additional details
Publishing Information
- Journal Title
- Acta Radiologica
- Journal Volume
- 39
- Journal Issue
- 5
- Journal Page Range
- p. 579-582
- ISSN
- 0284-1851
- CODEN
- ACRAE3
INIS
- Country of Publication
- Sweden
- Country of Input or Organization
- Sweden
- INIS RN
- 29056729
- Subject category
- S62: RADIOLOGY AND NUCLEAR MEDICINE;
- Descriptors DEI
- AORTA; CONTRAST MEDIA; DIAGNOSIS; DOSE-RESPONSE RELATIONSHIPS; DTPA; GADOLINIUM COMPLEXES; IMAGES; NMR IMAGING; PATIENTS; SPIN-LATTICE RELAXATION
- Descriptors DEC
- AMINO ACIDS; ANIMALS; ARTERIES; BLOOD VESSELS; BODY; CARBOXYLIC ACIDS; CARDIOVASCULAR SYSTEM; CHELATING AGENTS; COMPLEXES; DIAGNOSTIC TECHNIQUES; DRUGS; MAMMALS; MAN; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANS; PRIMATES; RADIOPROTECTIVE SUBSTANCES; RARE EARTH COMPLEXES; RELAXATION; RESPONSE MODIFYING FACTORS; VERTEBRATES