A MRI is non-invasive, does not use radiation, and provides good visualization of the spinal ligaments, a herniated disc, bony infection of the spine or disc. MRI scans use powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs, soft tissues, bone and other internal body structures. Differences between normal and abnormal tissue is often clearer on an MRI image than a CT.

A CT- scan, or a computed tomography scan, uses radiation to evaluate spinal abnormalities. A CT scanner sends X-ray beams through the body as it moves through an arc taking many pictures. A CT scan sees different levels of density and tissues inside a solid organ, and can provide detailed information about the body. For instance, a CT scan can be used to evaluate spinal fractures, disc herniation, and spinal stenosis, or narrowing of the spinal canal. CT scanning is more rapid than an MRI, and provides better detail of the bones of your spine.

So, which one is better?

That I leave up to the doctors. Based on what they are looking for in a patient, they decide which of the two tests should be done first. In some situations, they might need both.

Would things show on ct scan that didn't on x-Ray?
Yes.  Soft tissues such as discs do show on a CT, just not in as much detail as on an MRI. An advantage of CT is that it shows both hard and soft tissues so if your issues encompass both, it can be very useful. It is also more convenient than an MRI. It is over much quicker and you aren't completely enclosed in the machine.  

A CT scan is a type of x-ray. it used radiation to make the images. an MRI uses magentic fields to create the image, so no radiation. CT scan is better at showing issues with bones. MRI is better at showing soft tissue problems.

您要請專科醫生仔細看片子解釋，再看如何處理，但要避免久坐和提重物。

如果是腿麻，大概L4和L5也有hernia disc突出，如果很嚴重，這就大手術了。

平常做一些伸展體操，日常生活綁上護腰背。現在3m出了一種輕型護腰帶，在walmart的藥局有售。此外建議在浴室加把手，文中的把手不用釘，直接扣上平滑乾淨牆面，home depot和lowe都有賣。為預防突然悪化的背況，文中的助行椅和助行腿可以去先去garage和estate sale找到，大概只有原價的10%，但大多狀況良好，只是有點灰塵。助行椅要注意手煞車的狀況，煞車一定要𩆜光。

先看專科醫生！保重。