Exam 17: Computed Tomography

Slices of anatomy that go from head to foot are

Because of the minimal amount of scatter radiation produced during a CT scan, there is no need to be concerned with the protection of others who must remain in the room during a CT scan.

The collimator that improves image contrast by limiting the amount of scatter radiation that reaches the detector is the

Overlapping slices occur with a

The CT number is the same as an attenuation coefficient

This shading artifact is due to the beam energy changing (and therefore the CT numbers) as the beam passes through the anatomy

This translate-rotate scanner used a single detector

Noise can be reduced by using a

This specific area of the image is often selected to perform data analysis

Using a large matrix and thin slices improves

The collimator that limits the patient's radiation exposure is the

The CT gantry is stationary and cannot be tilted.

The small amount of tissue represented by a pixel is the

Children require special considerations in CT imaging because

Prior to spiral CT, the patient moved through the gantry one small increment or step at a time.

The number of rows and columns that make up the digital image is the

Automatic control of tube current along all three axes is

The transmission value for a single detector is a

The image matrix for CT is __________ than the image matrix for digital radiography.

Each major development in beam and detector geometry is called a