Ct Review

Front 1

An Agatston score of 250 on an MDCT cardiac examination for coronary artery calcification is rated as:

Back 1

The Agatston system quantifies coronary artery calcium as:

Minimal (1-10)

Mild (11-100)

Moderate (101-400)

Extensive (>400)

Front 2

What mathematical technique is used for the reconstruction of volumetric MDCT images?

Back 2

The 180-degree linear interpolation technique (180Ll) is commonly used for current MDCT image reconstruction. This method interpolates data acquired at a distance only 180 degrees away from the location of the reconstructed slice.

Front 3

A CT scanner measures the linear attenuation coefficient of a voxel of tissue as 0.40. The linear attenuation coefficient of water for this scanner equals 0.20. The CT number assigned to the pixel representating this voxel of tissue equals:

Back 3

+1000 HU

The CT number of a pixel may be calculated by subtracting the linear attenuation coefficient of water from the linear attenuation coefficient of the tissue within the voxel. This number is divided by the linear attenuation coefficient of water. The quotient is multiplied by a contrast factor of 1000 to yield the value of the pixel in Hounsfield units.

Front 4

The ability of the CT system to reduce involuntary motion artifacts and provide CT images free of motion artifact is determined by which of the following components of image quality?

Back 4

Temporal resolution

The stop-motion capability of a CT system is referred to as temporal resolution. Temporal resolution quantifies the CT system's ability to freeze motion and to provide an image free of blurring.

Front 5

The portion of the male reproductive system responsible for storage of the majority of mature sperm is the:

Back 5

vas deferens

The majority of mature sperm is stored in the vas deferens. Sperm is produced in the seminiferous tubules and passes thru the epididymis, where a small amount may be stored.