Hello. The MRI lumbar spine will show the lumbosacral spine. Just to give you an idea, MRI imaging is very detailed to the area of the body the scan was ordered. Each body part is separate and would require an additional order and would be a separate CPT code. Even when scanning a pelvis, we refer to it as a bony pelvis or female pelvis depending on the history of the patient. Of course, there could be an incidental finding that would require additional imaging. However, for MRI to look at your pelvic floor strength you would need what is referred to as a functional MRI. Most often this would be MRI defecography exam. If you live in the United States and are using insurance, your insurance company will most likely require a full work up of your pelvic floor before authorizing an exam like MRI defecography. I hope you get some answers soon.
It depends on what the tech is told to focus on and where the machine is pointing, I'm sure. Are you sure you have a weak pelvic floor? If so, can you ask the doctor if the scan can include that area?