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AJNR - American Journal of Neuroradiology

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Reduction of Radiation Dose for Cerebral Angiography Using Flat Panel Detector of Direct Conversion Type: A Vascular Phantom Study

Y. Hatakeyama^a, S. Kakeda^a, N. Ohnari^a, J. Moriya^a, N. Oda^a, K. Nishino^b, W. Miyamoto^b and Y. Korogi^a

^a Department of Radiology, University of Occupational and Environmental Health School of Medicine, Kitakyushu, Japan
^b Medical Systems Division, Shimadzu Corporation, Japan

View larger version (35K): [in this window] [in a new window]   Fig 1. Photograph (A) and schematic drawing (B) of the anthropomorphic vascular phantom used in this study. The phantom was designed to simulate the intracranial arteries with a total of 32 aneurysms. Of 32 aneurysms, 15 had a bleb with diameter of 2 mm.

View larger version (13K): [in this window] [in a new window]   Fig 2. ROC curves for the detection of simulated aneurysmal blebs with 3 different contrast material concentrations: 300 mg I/mL (A), 150 mg I/mL (B), and 100 mg I/mL (C). For each contrast material concentration, graph shows the 3 composite ROC curves generated from the pooled data of the 7 observers’ results with the standard- (solid line) and low-dose modes of FPD (dashed line) and the conventional-dose mode of I.I.-TV (dotted line) systems.

View larger version (46K): [in this window] [in a new window]   Fig 3. 2D DSA from the left anterior oblique view at 300 mg I/mL obtained with standard-dose mode of FPD system (A), with low-dose mode of FPD system (B), and with conventional-dose mode of I.I.-TV system shows blebs (arrows) (C). For the depiction of aneurysmal blebs, there is no particular difference among the 3 dose modes.

View larger version (51K): [in this window] [in a new window]   Fig 4. 2D DSA from the left anterior oblique view at 100 mg I/mL obtained with standard-dose mode of FPD (A), with low-dose mode of FPD (B), and with conventional-dose mode of I.I.-TV system shows blebs (arrows) (C). For the depiction of aneurysmal blebs, the images obtained with both dose modes of FPD system are superior to those obtained with the I.I.-TV system.