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As compared to PET, SPECT isotopes have _________ half life.(a) longer(b) shorter(c) equivalent(d) unstableI have been asked this question in an interview for job.I'd like to ask this question from PET & SPECT topic in section Diagnostic Investigation via Imaging Techniques of Clinical Science

Answer»

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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