Exam 11: Quality Control for Magnetic Resonance Imaging Equipment

Luminance uniformity of soft-copy displays used in MRI systems should be within ____ of the maximum brightness measured in the center of the screen.

Nonuniformity in the magnetic field can be caused by

The amount of geometric distortion in the image is the

The ability of an MR scanner to resolve small objects is known as

The ACR slice position deviation in MR scanners should not exceed ____ mm.

What is the maximum luminance for soft-copy display devices as suggested by the ACR?

A change in the strength of the main magnetic field can be caused by

The ability of the MR system to differentiate between adjacent tissues having minimal differences in signal intensities is known as

What is the resonant frequency in a unit with a 1.0-T magnet and a gyromagnetic ratio of 42.57 MHz/T?

An acquisition with a 200-mm field of view and 256 x and y encodes yields a pixel size of ____ mm².