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Fig. 1B. —31-year-old healthy male volunteer. Normal vascular anatomy of hand as shown on MR angiography. MR projection angiograms from three-dimensional volumes acquired 30 (A), 50 (B), 70 (C), and 90 (D) sec after injection of gadolinium contrast agent. In this healthy volunteer, a tourniquet was briefly applied to middle finger. Considerably less signal enhancement distal to tourniquet (arrow down, B) can be seen. Note loss of signal caused by mispositioning of coil in fifth digit (arrow up, B). Venous contamination is seen in B but not in A. RA = radial artery, UA = ulnar artery, SA = superficial palmar arch, DA = deep palmar arch, CD = common palmar digital arteries, PD = proper palmar digital arteries.

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