MRI is an abbreviation of Magnetic Resonance Imaging and the images are generated using strong magnetic fields, radio waves and magnetic field gradients. This means that no x-ray radiation is used and MRI is considered safe for most patients.
The most commonly seen MRI scanners can scan all body parts. Full-body MRI is however uncommon, as it is rarely medically indicated making it a costly and time-consuming appointment. Studies have shown little evidence on the benefits of MRI for full-body screening purposes.
Another downside to a full-body MRI is its inability to define the type of disorders. Scanning a large area means image quantity takes priority over quality and in order to have a precise diagnosis, another MRI of the targeted body region is recommended.
Your doctor will discuss your concerns with you and narrow down an area/areas for scanning. I.e buttock pain might warrant an MRI scan of both the hip and your lower back but scanning your whole back might not be indicated or beneficial.
MRI is a great screening tool to detect early changes in the brain, spine, breast, liver and gallbladder, kidneys, pancreas, uterus and ovaries and prostate where other screening modalities aren’t suitable.
Contrast (dye)
Some symptoms and illnesses can be hard to detect even on a MRI scan and require injection of dye (contrast) before or during the scan.
It is particularly helpful in the following conditions:
- Tumours
- Inflammation
- Blood vessels
- Distinguishing between scar tissue and normal organ tissue
The injection is considered very safe for most and you will complete a safety questionnaire detailing your medical history before. The contrast agent (dye) is Gadolinium based and most of it is removed by your kidneys within the next day.
Read more about Gadolinium contrast dye