thanks for the info!! I was just talking to a coworker a few days ago about bandwidth and she brought up questions that I could not answer. I have a good grasp on when to use higher bandwidth (along with other adjustments) to get better images, but explaining it isn't as easy.

Amazing work explaining bandwidth

Very informative Thank you 🙏

Good topic Julien. BW is nowadays little forgotten parameter for most of the time for many radiographers. I always try to look that (too) and because I’m mainly Philips MRI-oriented, when using Siemens, always pointing mouse to BW-box to get pop up window to show WFS instead of BW. It’s much easier to remember especially when using 1,5T and 3T in different days. WFS is same, BW you have to double in 3T to get same WFS. Of course pixels are smaller in 3T so WFS is smaller then in millimeters. In 3T orthopedic imaging I try to use WFS about 1.6-2.0 in FS seq.- it's about 260-215Hz/Px. In T1(or seq. without FS) I lower WFS to 1-1.5 (430-290Hz/px). Or lower with BLADE/Multivane/Propeller to 0,6- 1 WFS. In the video I think the ’problem’ is in T2 FS axial-sequence where used ES (echo spacing) was 14,3ms, little too high in 3T -maybe causing blurring/motion artefacts from breathing and veins. TF 12 and ES 14,3ms totals TF-chain lenght to 171,6ms, which is ok in T2-seq, but in 3T T2 FS I would try using higher TF to 15 and lower ES about 10ms resulting TF-chain lenght 150ms, but less blurring/motion and sharper looking images. It’s always good if possible in PD and T2 sequences to get asked (desired) TE in the center of TF-chain (’balanced TF-chain’) -so this desired echo is pointed in the center of k-space. I use in T2 FS TE about 60-80 (or maybe TE 60 to get little more signal) and if TF is 15 the 8. echo would be 80ms and in the middle of k-space (’balanced echo train’). Echoes 1-5 and 11-15 goes in outer k-space to gain resolution (or edge detail) and echoes 6-10 (60-100ms) in the center of k-space is doing mainly the contrast. With lowered ES and WFS 2 or under without FS- less chemical shift, artefacts and blurring. In orthopedic shoulder imaging in axial sequence I prefer PD FS instead of T2FS with TF 9-13, ES 10-8, WFS 2-1.8.TF-chain must be under 130ms when TE is 30-40 to get sharp images. In the Juliens video wider BW400Hz/Px images in T1-coronals is in my opinion much better looking, you can see labrum and small details clearly sharper. 200Hz/Px in T1 3T is not good image with WFS about 2.15 in my opinion. In T1 cor ES was 11.ms1 and the first echo 11.1ms (asked TE 11) is pointed in the middle of K-space with high signal amplitude. Also TF 3 and ES 10 would be ok-less SAR in 3T when only 3 echoes collected in one TR. In T1 there is no point balancing Tf-chain, when only 3-4 echoes and you want TE as low you can get, so the first echo is the desired echo in the middle of k-space. When using AI, I think you can raise BW/lower WFS even more to levels usually used only in metal reduction sequences and get better images when AI takes noise away.

hi decreasing the phase fourier like 7/6 will reduce the scan time and snr, how we should use