Inside length of the ACR large phantom is _________ mm
Inside diameter of the ACR large phantom is _________ mm
The ACR phantom is filled with a solution of nickel _________ and sodium ___________
The outside of the phantom has the words “_______” and “CHIN” etched into it as an aid to orienting the phantom for scanning, as if it were a head.
Which parameter can be determined without the using of ACR phantom
The ACR large phantom have ______ variation of axial slices
Which MRI parameter is NOT suggested when scanning the ACR large phantom?
What is the recommended slice thickness and gap when scanning the ACR large phantom to produce MRI images for QC analysis
The normal central frequency for 1.5 T MRI is __________ MHz/T
The normal central frequency for 3.0 T MRI is __________ MHz/T
ACR recommended criteria for central frequency is within +/-1.5 ppm different between weekly tests. (1.5 ppm = 96 Hz in 1.5 T MRI). What is ppm stand for?
Transmitter gain (Tx gain) in a Seimens MRI machine was read as transmitter amplitude in the unit of _________
The ___________________ test assesses the accuracy with which the image represents lengths in the imaged subject. The ACR recommended criteria: +/-2mm in all directions.
The _________________ test assesses the scanner’s ability to resolve small objects when the contrast-to-noise ratio is sufficiently high that it does not play a role in limiting that ability. There are 3 pairs of not-quite-square arrays of holes in the insert. It consists of an upper left (UL) hole array and a lower right (LR) hole array.
The ____________________ test assesses the extent to which objects of low contrast are discernible in the images. Can be measured on 4 slices: slices 8 through 11. In each slice, the objects appear as rows of small disks, with the rows radiating from the center of a circle like spokes in a wheel.