SPECT evaluation of brain perfusion reserve by the acetazolamide test using Tc-99m HMPAO.
This report describes a new approach to the evaluation of brain perfusion reserve using Tc-99m HMPAO SPECT. Consecutive brain Tc-99m HMPAO SPECT studies before and after acetazolamide (Diamox) administration were performed within 30 minutes on 19 patients with significant vascular occlusive lesions. Thirteen patients showed decreased perfusion reserve and four patients maintained perfusion reserve in the affected vascular territories after Diamox administration, providing additional information to baseline Tc-99m HMPAO SPECT in 17 (89%) patients. Although flow augmentation post-Diamox was underestimated, possibly due to the nonproportionality of Tc-99m HMPAO activity to true blood flow, significant changes in the brain perfusion pattern were both visually and quantitatively determined using an image subtraction technique. This consecutive Tc-99m HMPAO SPECT technique seems to be of practical use for the evaluation of brain perfusion reserve and for the improvement of the sensitivity of detecting pathologic areas.
Department of Nuclear Medicine, Kanazawa University School of Medicine, Japan.
H
H
Matsuda
S
S
Higashi
K
K
Kinuya
S
S
Tsuji
J
J
Nozaki
H
H
Sumiya
K
K
Hisada
J
J
Yamashita
D000086:Acetazolamide; D000368:Aged; D001921:Brain / Q000000981:diagnostic imaging*; D002560:Cerebrovascular Circulation / Q000187:drug effects* / Q000502:physiology; D002561:Cerebrovascular Disorders / Q000000981:diagnostic imaging*; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015609:Organotechnetium Compounds; D010091:Oximes; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013268:Stimulation, Chemical; D019690:Technetium Tc 99m Exametazime; D013997:Time Factors; D015899:Tomography, Emission-Computed, Single-Photon
D015609:Organotechnetium Compounds; D010091:Oximes; D019690:Technetium Tc 99m Exametazime; D000086:Acetazolamide