MRA acquisition
MRA acquisition
MRA acquisition
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Benefits of time-resolved imaging protocol<br />
Benefits of time-resolved imaging protocol<br />
Causes of early venous enhancement<br />
• Ulceration<br />
• Phlebitis<br />
• Neuropathic joint<br />
• Reduced muscle mass<br />
Neuropathic joint with hyper-enhancement<br />
enhancement<br />
58 year-old male post repair of ASD and PAPVR<br />
TR – 3.3 ms<br />
TE – 0.9 ms<br />
Flip - 30 0<br />
BW – 62.5 kHz<br />
FOV - 400 x 400 mm<br />
Matrix – 256 x 192<br />
24 x 10 mm slices (Zip 2)<br />
31 x 0:02.9 time frames<br />
15 cc at 3.0 cc/s Gadolinium<br />
Relative SNR% - 245%<br />
Scan Time 1:53 (Mask – 0:13)<br />
“Pause On” with separate mask and post-contrast<br />
<strong>acquisition</strong> breath-hold<br />
Incidentally diagnosed Right Pulmonary Venous Varix<br />
45 year-old patient with chronic pelvic pain<br />
Radial <strong>acquisition</strong>: HYPR<br />
• HYPR: HighlY constrained back-PRojection<br />
• Single radial readout used to reconstruct<br />
projection data<br />
• Very efficient for time-resolved <strong>MRA</strong><br />
TRICKS<br />
Radial readout<br />
(rotating lines)<br />
Mistretta CA, Wieben O, Velikina J, Block W, Perry J, Wu Y, Johnson K, Wu Y. Highly<br />
constrained backprojection for time-resolved MRI. Magn Reson Med. 2006;55:30-40.
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