CONTRAST-DETAIL CURVES FOR LIVER CT

被引：34

作者：

JUDY, PF ^{[1
]}

SWENSSON, RG ^{[1
]}

NAWFEL, RD ^{[1
]}

CHAN, KH ^{[1
]}

SELTZER, SE ^{[1
]}

机构：

[1] HARVARD UNIV,SCH MED,BOSTON,MA 02115

来源：

MEDICAL PHYSICS | 1992年 / 19卷 / 05期

关键词：

OBSERVER PERFORMANCE; LIVER; COMPUTED TOMOGRAPHY; CONTRAST-DETAIL CURVE;

D O I：

10.1118/1.596791

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Contrast-detail curves were constructed for liver computed tomographic (CT) images using an objective method. Stimuli were created by superimposing disks at specified locations on sets of 92 normal liver CT images. Bright and dark disks of 9 sizes and 36 possible image contrasts were used. Sets of 92 stimuli were rendered on film at five window widths (64, 128, 256, 512, and 1024 HU). The contrast-detail (CD) curve flattened substantially for disks larger than 7-mm diameter, and its slope (on a log-log plot) was less than predicted from signal-detection theory. Manipulation of display window manipulation had little impact on this disks' visibility. The results indicate that human observers have difficulty visualizing large, low-contrast details on liver CT scans, and suggest that narrowing the display window will have little effect on this limitation.

引用

页码：1167 / 1174

页数：8

共 38 条

[1] THE PERCEPTIBILITY OF DETAILS IN ROENTGEN EXAMINATIONS OF THE LUNG [J].