Quiz: MR Spectroscopy 5

Objectives: The hardware requirements for MRS are discussed including transmission, reception and multinuclear transmit-receive capabilities. The discussion includes RF quality and SAR, as well as how to limit chemical shift displacement artefacts, particularly in chemical shift imaging.

1. Ideally, my RF transmission (Tx) for MRS/MRSI should be...*

Fast and focused.
Strong, uniform and low SAR.
Multichannel, using many small coils.
Done with a surface coil.

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2. Ideally, my receive RF for MRS should...*

Be done with the body coil
Use as many channels as possible
Have high signal to noise (SNR) & high dynamic range
Use multiple coupled channels

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3. I can get rid of signals from the skull by...*

Using outer volume suppression methods
Using crusher coils
Using interfering signals to cancel out the unwanted skull signals
Any of the above

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4. Multinuclear MRS can have advantages over proton MRS because...*

There are no artefacts from water, so simple MRSI scans can be used to obtain reproducible data
There is generally much higher chemical shift dispersion, so low CSDA (chemical shift displacement artefact) in single voxel MRS
The sensitivity can be increased using polarization transfer from hydrogen nuclei
It is available on all MRI systems and hospitals get more reimbursement for metabolic scans

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