A general guide to patient preparation for radiological investigations

Abstract

Imaging studies form an integral part of patient work-up

and knowledge of patient preparation is essential to avoid

unnecessary study cancellations and delays.

Radiological imaging is comprised of several different

modalities. The method of imaging dictates patient

preparation.

Some of the imaging modalities (radiographs, fluoroscopy

and CT) use ionising radiation to obtain images whereas

sonar and MRI are performed without the use of ionising

radiation. Ultrasound essentially uses sound waves to

evaluate the acoustic properties of tissues and MRI utilises

magnets and radio waves.

Some imaging modalities may also require the administration

of intravenous contrast that further influences patient

preparation.

Patient preparation for imaging can be divided into two

main categories:

1. Pre-existing conditions affecting the study or use of

contrast agents

2. Study-specific preparation