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Deep Dose Equivalent
The deep dose equivalent is related to the dose in tissue at a depth of one centimeter due to external radiation. Also called personnel dose equivalent at a depth of 1 cm. The unit for deep dose equivalent is J/kg or sievert (Sv).
Archiving
This term usually refers to the storage of patient data and images. Images are best archived in digital form (e.g., on optical disks, DVDs, PACS systems) and not only on films (hard copies, prints). Data compression via a reduction in matrix size, pixel depth or CT numbers, will result in a loss of spatial and contrast resolution. Digital images should be converted into a universal format such as DICOM. Raw data saving is necessary when additional image reconstructions are required.

See also Picture Archiving and Communication System, and Digital Imaging and Communications in Medicine.
Computed Tomography Dose Index
(CTDI) The computed tomography dose index is most commonly used dose descriptor, which represents the dose to a location (e.g., depth) in a scanned volume.
This index describes the dose from a single rotation of a CT scanner. CTDI must be corrected for pitch or couch increment to receive the dose for a series of slices. The CTDI100 is measured using a 100 mm long ionization chamber. The CTDIair is the value of CTDI determined free-in-air.
Different definitions of CTDI exist and are used in different applications.
Directional Dose Equivalent
The directional dose equivalent is the equivalent dose at a point in a radiation field that would be produced by the corresponding expanded field at depth on a radius in a specified direction. The unit of directional dose equivalent in the SI system of units is joule per kilogram (J/kg) and sievert (Sv).
Eye Dose Equivalent
The eye dose equivalent is the radiation dose of the lens of the eye taken by external exposure. The dose equivalent is calculated at a tissue depth of 0.3 centimeters (300 mg/cm2).
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 [last update: 2023-11-06 02:01:00]