Author |
강건욱(Keon Wook Kang),이동수(Dong Soo Lee),곽철은(Cheol Eun Kwark),현인영(In Young Hyun),정준기(June Key Chung),이명철(Myung Chul Lee),고창순(Chang Soon Koh), |
Abstract |
We compared the influences of reconstruction methods
using 180¡Æor 360¡Ædata upon contrasts and
discriminating capability and diagnostic accuracy in
Tc-99m-MIBI stress/rest myocardial SPECT, We reviewed
SPECT images reconstructed only with 180¡Æprojection
data or with 360¡Ædata in 18 patients and in 11
normal subjects. To compare counts of surface
structures and deep structures, we measured
apex/posterior wall ratios in 11 normal subjects. To
compare the contrasts of images, we measured
apex/ventricle ratios. To compare contrasts between
normal and diseased myocardial segments, we measured
count ratios of defect and normal segments in 4
patients who had single coronary artery diseases. To
compare diagnostic accuracy, we scored SPECT images
made with 180¡Æand 360¡Æata segmentally.
Sensitivity and specificity for the diagnosis of
coronary artery disease and for the diseased arteries
with both 180¡Æand 360¡ÆSPECT images. If involvled
coronary arteries had more narrowing than 50% in
coronary angiogram, we considered them as diseased
arteries. Apex/posterior wall ratios were not different
significantly in normal subjects. Apex/ventricle ratios
in normal subjects were different, significantly
between 180¡Æand 360¡ÆSPECT images. Defect/normal
ratios were different significantly between 180¡Æand
360¡ÆSPECT images in single vessel disease patients.
The overall diagnostic accurracy was the same between
180¡Æand 360¡Ædata collection. Sensitivity was 94%
and specificity was 91% for both types of data
collection in this sample population. Sensitivity and
specificity of each coronary artery territory were not
significantly different between the images made with
180¡Æand 360¡Æ data. The images made with
180¡Ædata had better contrast between ventricle and
myocardium and between hypoperfused and normal
myocardium, though no difference was found between the
ratios of the myocardial counts of surface and deep
structures. However, diagnostic sensitivities of
diseased artery territories were not different
significantly and so were overall diagnostic accuracy
between both methods of making images with 180¡Æand
360¡Ædata |