Basic MRI Quality Assurance
MRI = magnetic resonance imaging
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- 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.
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