List of top Medical Imaging Systems Questions on Magnetic Resonance Imaging asked in GATE BM

An MRI signal acquired from a tissue has a transverse relaxation time (\(T_2\)) of 100 milliseconds (ms). If the signal intensity at time \(t = 0\) ms is 500 a.u., the signal intensity at \(t = 50\) ms is a.u. (Round off to one decimal place).

The gyromagnetic ratio of \(^{31}P\) nucleus is 17.23 MHz/Tesla. The Larmor frequency of \(^{31}P\) nucleus in an MRI scanner with a field strength of 3 Tesla is MHz. (Round off to one decimal place).

A Magnetic Resonance Imaging (MRI) sequence is shown in the figure below, wherein \(T_R\) is the repetition time and \(T_E\) is the echo time. Which one of the following options is the correct name of this MRI sequence?

Consider the Einthoven’s triangle of frontal ECG for the electrodes RA, LA, and LL. At the peak of the R-wave, the cardiac vector $M$ points vertically downward with $|M| = 5 \text{ mV}$. The voltages on leads I and II are _________ mV and _________ mV, respectively.

In MRI, the terms T1 and T2 time constants are crucial for obtaining suitable weighted images. Choose the correct explanation.

An RF pulse is applied to acquire an axial MR image at the isocenter of a 1.5T MRI scanner with slice thickness of 2.5 mm. Assuming a gradient field strength of 2 Gauss/cm is applied and Gyromagnetic ratio of protons is 42.58 MHz/T, the RF pulse bandwidth required for slice selection is \(\underline{\hspace{2cm}}\) kHz.