An antiscatter grid is generally placed between the patient and the detector. __

Question

An antiscatter grid is generally placed between the patient and the detector. _______ The value of MTF of an imaging system typically increases as the spatial frequency decreases. _______ In MRI, electromagnetic radiation in the visible range are used to excite hydrogen nuclei. _______ In ultrasound, the transducer is used to generate radio-frequency pulses. _______ T_2 is used to characterize the decay of the transverse magnetization. _______^99m Tc is commonly used in PET imaging. _______ In MRI, the frequency encoding gradient is applied during sampling time. _______ A grid with a higher grid ratio stops more scattered x rays. _______ In PET imaging, two photons each of energy 511 keV are detected for image reconstruction purposes. _______ Amorphous selenium detectors are of the direct conversion type. _______

Explanation / Answer

a) True

b) True

c) False , radiation in the radio range

d) False , generates ultrasound pulses

e) True

f) True

g) True

h) True

i) True

j) True

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