Computer-derived regions of interest for the determination of renal parenchymal transit time

1993 ◽  
Vol 14 (3) ◽  
pp. 176-180 ◽  
Author(s):  
D. J. LI ◽  
K. A. MILES ◽  
R. W. BARBER ◽  
E. P. WRAIGHT
Keyword(s):  
Transit Time ◽  
Regions Of Interest

Determination of Myocardial FFA Elimination Rates by Functional Images of Uncorrected Half-Time Values

1984 ◽  
Vol 23 (06) ◽  
pp. 277-282 ◽  
Author(s):  
A. Van Lingen ◽  
G. Westera ◽  
M. van ◽  
W. Den Hollander ◽  
E. E. Van der Wall ◽  
...  
Keyword(s):  
Coronary Artery ◽  
Regions Of Interest ◽  
Heptadecanoic Acid ◽  
Half Time ◽  
Alternative Method ◽  
Functional Images ◽  
Functional Image ◽  
Back Ground ◽  
Objective Determination

SummaryThis paper presents an alternative method of demarcating regions of in terest over the myocardium after ad ministration of 123I-heptadecanoic acid to patients with coronary artery disea se. In a matrix of 32 × 32 pixels the elimination rates of the radioactivity, which are not corrected for back ground activity, are visualized per pixel in a functional image. The func tional image showed areas in the myocardium with high values of uncorrected elimination rates. These areas corresponded with the tracer defects on the scintigram. Corrected elimination rates obtained from re gions of interest of functional images were comparable with those of scinti grams. Thus based on functional im ages of uncorrected elimination rates a reliable, objective determination of regions of interest over normal and abnormal myocardium can be made.

Use of X-ray CT-defined regions of interest for the determination of SPECT recovery coefficients

1997 ◽  
Vol 44 (4) ◽  
pp. 1594-1599 ◽  
Author(s):  
H.R. Tang ◽  
J.K. Brown ◽  
B.H. Hasegawa
Keyword(s):  
Regions Of Interest ◽  
X Ray
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