General Radiology

Angiography

What is angiography? Angiography is the X-ray imaging of blood vessels using contrast agents injected into the bloodstream through a thin plastic tube (catheter) that is placed directly in the blood vessel. The images taken are called angiograms. Angiography provides information about blood vessel abnormalities, such as narrowing, blockage, inflammation, abnormal widening and bleeding, using... View Article

Arthrogram

What is an arthrogram? An arthrogram is a diagnostic test which examines the inside of a joint (e.g. shoulder, knee, wrist, ankle) to assess an injury or a symptom you may be experiencing. The test is done by first injecting contrast medium (sometimes referred to as a contrast agent or “dye”) which outlines the soft... View Article

Bone Mineral Density Scan (Bone Densitometry or DXA Scan)

What is a bone mineral density scan? A dual-energy X-ray absorptiometry scan (DXA), or bone density scan, is a special type of X-ray that measures bone mineral density (BMD). It provides information about bone strength or fragility and the risk of fractures or broken bones. The higher the density, generally, the lower the risk of... View Article

Computed Tomography (CT)

What is computed tomography? Computed tomography is commonly called “CT”. It was once called a “CAT” scan, though advances in scanning technology have resulted in the A being removed from the acronym. CT is a way of using X-rays to take pictures or images in very fine slices through the part of the body that... View Article

Contrast Medium: Using Gadolinium or Iodine in Patients with Kidney Problems

What is contrast medium? Contrast media (sometimes called contrast agents or dye) are chemical substances used in medical X-ray, magnetic resonance imaging (MRI), computed tomography (CT), angiography, and occasionally ultrasound imaging. Contrast media enhance and improve the quality of images (or pictures), so that the radiologist (a specialist doctor trained to examine the images and... View Article

Dual Energy CT Scan

What is a dual energy CT scan? Standard computed tomography (CT) scanners use normal X-rays to make cross-sectional ‘slice-like’ pictures or images of the body (see InsideRadiology: Computed Tomography). A dual energy CT scanner is fairly new technology that uses both the normal X-ray and also a second less powerful X-ray to make the images.... View Article

Gadolinium Contrast Medium (MRI Contrast agents)

What is gadolinium contrast medium? Gadolinium contrast media (sometimes called a MRI contrast media, agents or ‘dyes’) are chemical substances used in magnetic resonance imaging (MRI) scans. When injected into the body, gadolinium contrast medium enhances and improves the quality of the MRI images (or pictures). This allows the radiologist (a specialist doctor trained to... View Article

Iodine-containing contrast medium

Prof Stacy Goergen What is Iodine-containing contrast medium? Iodine-containing contrast medium (ICCM), sometimes called contrast or contrast medium, is a chemical substance used in medical X-ray imaging. When injected into the body, ICCM shows what is happening inside the hollow parts of the body (like blood vessels, the stomach, bowel or even the fluid around... View Article

Magnetic Resonance Imaging (MRI)

Mr Richard McIntyre Prof Stacy Goergen What is magnetic resonance imaging (MRI)? Magnetic resonance imaging (MRI) is a scanning procedure that uses strong magnets and radiofrequency pulses to generate signals from the body. These signals are detected by a radio antenna and processed by a computer to create images (or pictures) of the inside of... View Article

Myelogram

Prof Mark Khangure Dr Jason Wenderoth What is a myelogram? The spine is made up of bones called vertebrae. At the front of the spine is solid bone, and at the back there is a bony canal, or channel called the spinal canal. The spinal canal contains a fluid-filled tube extending from the base of... View Article

Plain Radiography/X-rays

What is plain radiography/X-rays? Radiography is the imaging of body structures using X-rays. X-rays are a form of radiation similar to visible light, radiowaves and microwaves. X-radiation is special because it has a very high energy level that allows the X-ray beam to penetrate through the body and create an image or picture. The image... View Article

Radiation Risk of Medical Imaging for Adults and Children

What is radiation – am I exposed to background radiation each day even if I do not have an X-ray examination? Background radiation Background radiation refers to the ionising radiation from high energy particles or rays that we are unavoidably exposed to in our daily lives, which gives each of us a small but continuous dose of... View Article

Ultrasound

What is an ultrasound? Ultrasound is the term used for high frequency soundwaves. An ultrasound examination uses these sound waves to produce an image onto a screen that shows the inside of your body. An ultrasound examination is performed by a trained health professional (sonographer, radiologist or sonologist) using a smooth, hand held device called... View Article