The Radiology Department, sometimes called the x-ray, is the facility in the hospital which carries out the radiological examinations of patients, using a range of equipment, including x ray, CT scanning, ultrasound and magnetic resonance imaging (MRI).
The radiologists are doctors specially trained to interpret the results and carry out some of the more complex examinations. They are supported by radiographers who are highly trained to carry out many of the x-ray and other imaging procedures.
Magnetic resonance imaging (MRI) is a specialised imaging modality that obtains multiple cross-sectional images of the organs and tissues of the body. MRI is similar to CT but is able to image the body in all dimensions and is often complimentary to CT examinations. The advantage of MRI is its ability to demonstrate the differences between soft tissues without using radiation (X rays). A computer processes the images to create cross-sectional pictures or "slices" of the area of interest. No preparation is required prior to the exam.
MRI in colorectal imaging is used specifically to image the anus and rectum. MRI is able to take a closer look at these areas allowing a more accurate information to allow the surgeon and oncologist decide the best treatment. MRI can also be used to identify the blood supply to these areas.
The MRI scanner is a large unit with a hole running directly through its center, giving the appearance of a doughnut. It is however longer than a CT scanner. You will lie on a table that can move up or down and can slide into and out of the center of the cavity. The computer is not in the examining room, but in an adjoining control room.
The radiographer will ask you important questions before you are allowed to enter the scanner room. The MRI uses a very strong magnet and the radiographer needs to establish that it is safe for you to enter the room. You will be correctly positioned on the MRI table. Short initial scans will be obtained to plan the more detailed imaging. The scans are very noisey, you will be given ear plugs and can listen to music via headphones if you like. You will be asked to remain as still as possible and on occasion asked to hold your breath. A small canula may be inserted into an arm vein and contrast injected into the vein.
You must tell the radiographer if you have any allergies to medications or whether you have a history of asthma, diabetes, a heart disorder or kidney disease. These conditions may indicate a greater risk of an adverse reaction to contrast material.
MRI scanning is a pain-free procedure. You will however be placed into the machine which can feel a little claustrophobic. The radiographer will give you eye patches if you wish and reassure you during the procedure.
The examination usually takes 45 minutes, including preparation time.
A radiologist experienced in MRI scanning will examine and interpret the MRI findings. After reaching a conclusion, the radiologist will send a detailed report to your consultant, who will give you the results.
If you have a query about having an MRI scan, please ring the Radiology Department (MRI department) between 9am and 5pm, Monday to Friday &, 9am and 12pm Saturday.