From my situation, would you assume that this is what I will be having (a regular supine 3T MRI of my neck)? I know it is supine b/c I asked our doctor but do I need to specify to the Imaging Center that it should be "3T" (or is that basically a given)?
It's definitely not a given. Many imaging centers (such as mine) use both 1.5T and 3T machines. The 1.5T machines aren't necessarily inferior to the 3T machines for any given task; the newer 1.5T machines are much better than the original ones. The 1.5T machines have the advantage of a wider field of view and fewer artifacts, while the 3T machines offer the highest resolution.
When I called to make my appointment, I specified the 3T machine. The machine that was used for my scan looked brand new. But at the end of the scan, when I asked if it was a 3T machine, I was told that it was a 1.5T machine. I ended up having a meeting with the director of imaging services, who explained the various trade-offs between the 1.5T and 3T machines, and explained that the 1.5T machine was typically used for cervical spine scans. I told him about my request for the 3T, and that that was what my doctor wanted, though he noted that the 3T machine was not requested on my doctor's order. He thought that the scans I had would be quite sufficient for detecting Chiari malformation or CCI (he was quite familiar with both of them), but after a little negotiating, he said he would agree to repeat the scan at no charge if my doctor was not satisfied with the results of the 1.5T scan for any reason. I've gotten the report back from the center's radiologist, who did not find any signs of Chiari malformation or CCI on the 1.5T scan; I am now waiting to hear back from my doctor as to whether or not he wants the scan repeated with the 3T machine.
Short answer: If you want to be sure you're getting scanned with a 3T machine, you need to verify this at every step of the process.
I have the same doctor as @@jeff_w and @@Forçe e Honra and I currently have significantly worsening neck pain that originally started from a car accident in 2006 when I was hit and my car flipped upside down and I had horrible whiplash. However, after my doctor asked me many questions in our recent phone consult, he does NOT feel that I have CCI (and I agree) vs. that I have worsening cervical stenosis and radiculopathy.He wants me to get a regular MRI of my neck to compare to one that I had in 2010 (so it can help guide treatment in my PT or possibly provide other diagnostic info) but nothing beyond that.
In your case, the 1.5T machine might be the better choice. I'd recommend checking with your doctor.