Tossy classification divides dislocations in AC joint into three grades. It was later extended by Rockwood et al. by another three types. Normal width of AC joint is considered 1-3mm, widened AC joint has >7mm in men or >6mm in women.

The classification of lesions of labrum glenoidale was published by Snyder et al. and had originally four types. Later, several authors added descriptions of other labral lesions.

Radiation dose from a CT examination in standard body regions can be estimated from the dose-lenght product (DLP) that each CT outputs. This table shows known commonly used coefficients and their adjustment in two particular CT machines. The calculation of the efective dose estimation is:

E(mSv) = coefficient * DLP * 0.001

The most recent recommendation is based on the ICRP 103 publication (last column).
 

In July 2005, Radiology published a consensus proposal for reporting in CT colonography. It has similar purpose and structure as Bi-RADS reporting system in breast imaging. According to this proposal, lesions and massess should be describes by:

• Lesion size: the largest dimension (excluding stalk in pedunculated polyps) measures on MRP or 3D views.
• Morphology:
  • Sessile: broad-based with height > width
  • Pedunculated: polyp with a stalk

Coronary calcium score is an independent predictor of risk of significant coronary artery disease. It may refine overall risk of coronary artery disease estimated with conventional risk factors. It is based on CT examination and calculation of the Agatston score from the images.

In healthy adult individuals, the maximum allowable volume of intravenous iodine contrast is:
≤300mL (with concentration 300mg I/mL).
In patients with renal insufficiency in particular, the volume of the contrast should be as low as reasonable. However, it should not exceed
440 x weight [kg] / creatinine [µmol/L] mL
resp.
5 x weight [kg] / creatinine [mg/dL] mL
(with concentration 300mg I/mL).

This formula can be used to estimate volume of the liver on crossectional imaging methods by measuring its maximum dimension in three perpendicular axes - caudocranial (CC), latero-lateral (LL), antero-posterior (AP). A normal value is considered <2000mL.

Volume = CC x LL x AP x 0.31

Fisher CT grading scale is used to grade severity of intracranial subarachnoid hemorrhage associated with rupture of an intracranial aneurysm. This scale predicts the risk of subsequent arterial spasms.

Apart from giving the dimensions of an intracranial aneurysm, its size should be cathegorized according to this table.

The diameter of the neck of the aneurysm is cathegorized as well.

Grading of intracranial hemorrhage in neonates is based on ultrasound imaging. It has four grades with increasing mortality and decreasing outcome.