Otherwise MR angiography
cannot detect arteries less than 1.0mm diameter and costs higher and it is not widely available (Rozen et al., 2008).
(5) There is little role for CT or MR angiography
, as both modalities are usually ineffective for visualizing the AOP.
Contrast-enhanced MR Angiography
of the renal arteries: blinded multicenter crossover comparison of gadobenate dimeglumine and gadopentetate dimeglumine.
Coronary CT angiography and MR angiography
of Kawasaki disease.
Investigations including CT angiography, color Doppler ultrasonography, MRI, MR angiography
, endoscopic ultrasonography, gastric emptying scintigraphy, and esophago-gastroduodenal radiography may be used for the diagnosis.
Intra-voxel dephasing can be reduced using smaller voxels, shorter TE, and flow compensation.6 TOF sequences with shorter TEs have reduced extent of spatial encoding sequence gradients and are therefore less sensitive to high-order motion that leads to better assessment of stenosis.16 Smith et al.17 proposed that TOF MR angiography
with TE of 5.1 ms improved signal intensity recovery compared with TE of 6.5 ms.
Carotid endarterectomy: Preoperative evaluation of candidates with combined doppler sonography and MR angiography
. Work in progress.
Carotid MR angiography
revealed 40% stenosis in the right internal carotid artery (ICA); no stenosis was seen in the left ICA.
Time-Resolved MR Angiography
(TWIST) and High-Resolution 3D Angiography (FLASH).
Despite advanced imaging techniques, such as time-resolved contrast-enhanced MR angiography
, invasive spinal angiography is still the definitive test [1, 8].
Unenhanced MR angiography
sequence ([T2.sup.*] images can be obtained on any scanner by performing a gradient-echo sequence multiple times at different TE values using a fixed TR of approximately 150 milliseconds.