Technical optimization of four-channel multidetector-row helical computed tomography for depicting arterial stenosis: a phantom study |
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Authors: | Takahashi S Takamura M Yamamoto S Kudo M Narumi Y Murakami T Nakamura H |
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Institution: |
a Department of Clinical Informative Imageology and Department of Radiology, Osaka University Graduate School of Medicine, Osaka, Japan; Department of Radiology, Osaka University Hospital, Osaka, Japan; GE Yokogawa Medical Systems, Tokyo, Japan |
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Abstract: | Purpose: To determine the effects of detector configuration, as well as vessel orientation, on the depiction accuracy of arterial stenosis using four-channel multidetector-row helical computed tomography (MDCT) angiography in vitro.
Material and Methods: Five acrylic vessel phantoms (3?mm in diameter with 25 or 50% stenosis, or 5?mm with 25, 50, or 75% stenosis) were scanned with a four-channel MDCT scanner at five vessel orientations (0, 30, 45, 60, and 90° to the z-axis) using 4×1.25, 2.5, 3.75, and 5.0-mm detector configurations at beam pitches of 0.75 and 1.5. The percentage of stenosis was calculated by the ratio of the full width at half maximum for stenotic and non-stenotic portions of the phantom, and compared to the actual known values.
Results: A detector configuration of 4×1.25?mm provided good reproducibility, as well as high accuracy for assessing vessel stenosis, while a 4×2.5-mm or wider detector configuration caused underestimations of stenosis. Although the phantoms perpendicular to the z-axis were underestimated, the errors were kept in clinically acceptable ranges using the 4×1.25-mm detector configuration.
Conclusion: Four-channel MDCT accurately discerns stenosis for vessel phantoms of 3 or 5?mm in diameter at any orientation when using a detector configuration of 4×1.25?mm. |
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Keywords: | CT angiography technical aspect vascular |
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