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As compared to PET, SPECT isotopes have _________ half life.

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As compared to PET, SPECT isotopes have _________ half life.

(a) longer

(b) shorter

(c) equivalent

(d) unstable

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I'd like to ask this question from PET & SPECT topic in section Diagnostic Investigation via Imaging Techniques of Clinical Science

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Correct choice is (a) longer

Explanation: Since PET has 2 gamma rays, it uses the correlation of the images to form the final image. The process is also faster. However, with SPECT, there is only 1 gamma ray produced. The process is longer. Thus, for better imaging and allowing multiple imaging with a single shot of dye, SPECT radioisotopes need to have a longer half life.

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