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Optimal thallium-201 Dose in Cadmium-Zinc-Telluride SPECT Myocardial Perfusion Imaging

Masaru Ishihara, Yasuyo Taniguchi, Masahisa Onoguchi, Takayuki Shibutani

J Nucl Cardiol. 2018 Jun;25(3):947-954.

PMID: 28008559

Abstract:

Background:
We aimed to determine the optimal thallium 201 chloride (thallium-201) dose using a novel ultrafast cardiac gamma camera with cadmium-zinc-telluride (CZT) solid-state semiconductor detectors (D-SPECT).
Methods and results:
The optimal thallium-201 dose for obtaining left ventricular (LV) myocardial counts was determined from a phantom study. Consecutive 292 patients underwent stress myocardial perfusion imaging with a thallium-201 injection. Stress test comprised exercise or pharmacological (adenosine) provocation. We calculated an optimal thallium-201 dose that resulted in better LV myocardial counts during 6 minutes of acquisition time. We corrected the respective values according to the patient's age, sex, body mass index (BMI), and type of stress test. The lowest thallium-201 dose for obtaining acceptable imaging was 1.2 million counts. Radiopharmaceutical doses showed a positive correlation with the patient's age (P < .001), sex (P = .012), BMI (P < .001), and type of stress test (P < .001). Multivariate analysis revealed that the patient's BMI and the type of stress test were statistically significant factors for determining the correct radiopharmaceutical dose (P < .001 for both).
Conclusions:
For clinical use of the CZT SPECT system, the optimal individual thallium-201 doses can be determined based on the patient's BMI and type of stress test.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AP1315113 Zinc telluride Zinc telluride 1315-11-3 Price
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