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Optimization of shaded surface display for CT angiography.

Abstract：

RATIONALE AND OBJECTIVES:The authors performed this study to determine the optimum threshold for performing computed tomographic (CT) angiography with shaded surface display (SSD). MATERIALS AND METHODS:A dedicated phantom was developed with an 8-mm luminal diameter. Each of 19 vessels had stenoses ranging from 0% to 93.8%. Five blinded, experienced reviewers separately measured each vessel by using SSD with display thresholds of 50, 100, 150, and 200 HU. RESULTS:For vessel diameters of 2 mm and larger, the best threshold value was 100 HU. This yielded measurements within 2% of the actual diameter and produced no false occlusions. For vessels 1 mm in diameter, the best threshold remained 100 HU, but this threshold was significantly less accurate than the standard (P = .0001) and produced two false occlusions in 15 vessels. For vessels 0.5 mm in diameter, the best threshold was 50 HU, although this still produced measurements significantly less accurate than the gold standard (P = .036) and one false occlusion in 15 vessels. CONCLUSION:CT angiography with SSD and an optimized threshold value is a useful technique in vessels 1 mm and larger.

journal_name

Acad Radiol

journal_title

Academic radiology

authors

Addis KA,Hopper KD,Iyriboz TA,Kasales CJ,Liu Y,Wise SW

doi

10.1016/S1076-6332(03)80641-4

keywords:

subject

Has Abstract

pub_date

2001-10-01 00:00:00

pages

976-81

issue

10

eissn

1076-6332

issn

1878-4046

pii

S1076-6332(03)80641-4

journal_volume

8

pub_type

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