According to Johns Hopkins Medicine, a CT scan shows body parts such as organs, bones, fat and muscle in greater detail than a usual X-ray can provide. A CT scan does use X-rays, but the beam circles the area to be scann... More »

An integrated PET-CT scan is a diagnostic test used to detect cancer and help determine its stage. It combines the images from a positron emission tomography, or PET, scan and a computed tomography, or CT, scan at the sa... More » Health Diagnostics & Imaging

According to Wentworth-Douglass Hospital, a CT scan utilizes ionizing radiation to produce an image, and an MRI uses magnets and radio frequencies to produce an image of the body. Both machines look very similar, but the... More » Health Diagnostics & Imaging

Attenuation refers to how dense a part of the body appears relative to other body parts on a CT scan or X-ray, according to MedPix; while hypoattenuation means lower density, hyperattenuation refers to higher density. At... More »

An MRI scan is a medical test that uses a magnetic field and radio waves to create a detailed picture of organs and other structures inside the body. MRI stands for magnetic resonance imaging. More »

With a central bone density scan, the patient lies on a table while the scanner passes over his body, emitting X-rays to test the density of bones in the lower spine and hips, according to MedlinePlus. The purpose of the... More »

A CT, or computed tomography, scan allows doctors to look inside the body to see body organs, blood vessels and bones, as explained by WebMD. CT scans are used to check for tumors, assess blood flow and diagnose conditio... More » Health Diagnostics & Imaging