Free MRI Registry Questions and Answers

Question 1

Require the employment of solenoid coils because of the B0's orientation; these coils are more effective than linear coils and can be electrically combined with other coils to enhance signal homogeneity across an area of interest.

Accepted Answer

Vertical

Answer

Vertical coils are specifically designed for MRI systems where the main magnetic field (B0) is oriented vertically, often found in open or permanent magnet systems. These coils are more effective than linear coils in this orientation and can be electrically combined with other coils to enhance signal homogeneity across the area of interest, optimizing signal reception for vertical field systems.

Question 2

Provide more coverage area without sacrificing signal-to-noise ratio by using numerous coils and receivers.

Accepted Answer

Phased array

Answer

Phased array coils consist of multiple small, independent receiver coils, each with its own receiver channel. This innovative design allows for a larger field of view (coverage area) without sacrificing the high signal-to-noise ratio (SNR) typically associated with smaller coils. The signals from individual coils are then combined to form a comprehensive and high-quality image.

Question 3

A small bandwidth makes _slices possible.

Accepted Answer

Slimmer

Answer

In MRI, the slice selection gradient, in conjunction with the radiofrequency (RF) pulse, determines the slice thickness. A smaller receiver bandwidth means that a narrower range of frequencies is sampled. This corresponds to a smaller range of magnetic field strengths along the slice selection gradient, resulting in the selection of a thinner, or 'slimmer,' slice.

Question 4

The placement of the slice is established by the

Accepted Answer

The RF pulse's transmit frequency

Answer

The placement of the slice in MRI is precisely established by the transmit frequency of the RF pulse. When a magnetic field gradient is applied, protons at different locations precess at different frequencies. By selecting a specific RF transmit frequency, only protons resonating at that exact frequency within the gradient field will be excited, thereby defining the slice's position.

Question 5

The range of frequencies sampled during the process is represented by the receiver bandwidth.

Accepted Answer

gradient of frequency encoding

Answer

The receiver bandwidth in MRI represents the range of frequencies sampled during the signal acquisition process. This range of frequencies is directly linked to the frequency encoding gradient, which spatially encodes information along one dimension of the image. A wider bandwidth allows for faster acquisition but can lead to a reduction in signal-to-noise ratio (SNR).

MRI - Magnetic Resonance Imaging Practice Test

MRI - Magnetic Resonance Imaging Practice Test

Free MRI Registry Questions and Answers