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Why is a Pulse Height Analyser needed in a gamma camera?

To allow physiological gating

To calculate the energy of the scintillation event

To calculate the X,Y position of the scintillator event

To help discriminate between scattered and non-scattered photons

What is the disadvantage of using a high resolution collimator on a gamma camera?

Lower sensitivity

Less scatter rejection

More distortion

Limited field of view

Which of the following parameters would have no effect on image noise in the reconstructed nuclear medicine SPECT image?

Patient to collimator distance

Number of SPECT iterations in an iterative reconstruction

Administered activity

Longer acquisition time

Below is an image of a SPECT phantom. Using the ROI stats below, calculate the contrast to noise ratio in the central darker region to 2 decimal places.

Yellow ROI (central region): Mean = 4.83, Min = 4.15, Max = 5.56, Median = 4.83, standard deviation = 0.32

Red ROI (other region): Mean = 0.96, Min = 0.82, Max = 1.30, Median = 0.92, standard deviation = 0.12

185MBq of I-123 DaTSCAN (half-life 13.1 hours) is administered to a patient at 09:00. What activity is present in the patient at 10:30? Assume there is no biological clearance of the radiopharmaceutical. Give the answer in MBq.