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In a nuclear medicine scan using 99mtc the image snr for a

In a nuclear medicine scan using 99mTc, the image SNR for a 30-min scan was 50:1 for an injected radioactive dose of 1 mCi (3.7x10^7 disintegrations per second). Imaging began immediately after injection.

a) If the injected dose were doubled to 2 mCi, what would be the image SNR for a 30-min scan?

b) If the scan time were doubled to 60 min with an initial dose of 1 mCi, what would be the image SNR?

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Physics: In a nuclear medicine scan using 99mtc the image snr for a

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