On the 19th of August we had the last Spectroscopy study group virtual meeting dedicated to the consensus papers. https://www.ismrm.org/virtual-meetings/virtual-meetings-archive/
Following in the post are all the titles and questions asked during the meeting. Feel free to comment and discuss the topics below.
Title: Terminology and concepts for the characterization of in vivo MR spectroscopy methods and MR spectra: Background and experts’ consensus recommendations
Speaker: Roland Kreis, PhD
Questions:
For the definition of SNR it was mentioned to clearly define the no of points acquired for FID SNR is there a best no of points to acquire?
CRB’s is there some indication/recommendation for the threshold?
What would it be the best way to calculate SNR if GRAPPA was used?
What is fit quality number (FQN) and how can we obtain it?
zero filling - should we acquire less points for the SNR in FID and zero fill afterwards for resolution?
What is in the end the right word for “single acquisition” or single readout?
What is the argument against using “transient”? How can we ensure that the terminology is complied with in the future? I guess, paying attention to this when reviewing manuscripts?
Should a manuscript be rejected if not adhering to these guidelines?
How did it take from first discussions to publication? Any advice if you were going to go through this type of collaboration again?
Title: Spectral editing in 1H magnetic resonance spectroscopy: Experts’ consensus recommendations
Speaker: In-Young Choi, PhD
Questions:
What is the length of the adiabatic refocusing pulse? Is there a way to shorten it? also for the multiband RF pulse?
How about the RF coil selection for editing at 3T? Using dedicated Tx/Rx head coils might lead to reduction in SNR compared to multi-channel Rx only coils. If Editing scans are embedded in a clinical protocol, this also might require a change of RF coils during the exam. Still, use a Tx/Rx coil?
Answer: That is a problem since changing a coil is just not practical during the clinical scan. Then we recommend to use (semi-)LASER-based editing seq with high bandwidth refocusing pulses as we stated.
Title: Water and lipid suppression techniques for advanced 1H-MRS and MRSI of the human brain: Experts’ consensus recommendation
Speaker: Ivan Tkac, PhD
Questions:
IS the DIXON method not usable to suppress the lipid? What about the usage of the fat insensitive RF pulse?
is the Hamming filter better than the Hanning? if so, why?
Can you comment on the susceptibility of MC to sidebands and if this differs between Scanner vendors?
What is the best WS method for MRSI?