Pelvis MRI
Magnetic resonance imaging (MRI) uses a magnetic field, radio waves and a computer to create detailed image slices (cross sections) of the pelvis (trunk bone). This allows the physician to evaluate different types of body tissue in the area, as well as distinguish normal, healthy tissue from diseased tissue.
The patient must empty the bladder two hours before the exam and not void again until the exam is complete. If patients are claustrophobic (fearful of small, enclosed areas) or experience pain when lying on the back for more than 30 minutes, the doctor may prescribe a relaxant or pain medication.
For this exam, the patient is positioned on the scanning table feet first with arms at the side. Coils (special devices to improve image quality) may be placed on or around the pelvic area of the body. The scanning table slides into the magnet, covering the lower body. During the scan, patients do not feel anything, but they hear intermittent humming, thumping, clicking and knocking sounds. Earplugs are provided to help mask the noise.
In some cases, the radiologist requests a contrast agent (dye) to improve the quality of the images. Before the exam, patients must inform the technologist, radiology nurse and/or physician if they have allergies, are pregnant or are nursing. Patients may eat and drink before the exam. The contrast agent is injected into a vein in the arm, which may cause a cool sensation. As pictures are taken, the patient must hold very still, and in some cases, hold their breath. The technologist is always able to see and hear the patient during the approximately 45- to 60-minute exam.
