Dose area product
Encyclopedia
Dose area product is a quantity used in assessing the radiation risk from diagnostic X-rays examination and interventional procedures. It reflects not only the dose
within the radiation field but also the area of tissue
irradiated. Therefore, it may be a better indicator of the overall risk of inducing cancer than the dose within the field. It also has the advantages of being easily measured, with the permanent installation of a DAP meter on the X-ray set. DAP is expressed in Gray
square centimetres
(Gy*cm²) (sometimes mGy*cm² or cGy*cm²). Manufacturers of DAP meters usually calibrate them in terms of absorbed dose to air.
Kerma area product (KAP) is a related quantity which for all practical radiation protection purposes is equal to dose area product. However, strictly speaking DAP = KAP x (1-g) where g is the fraction of energy of liberated charged particles that is lost in radiative processes in the material, and the dose is expressed in absorbed dose to air. The value of g for diagnostic X-rays is only a fraction of a percent.
Coronary angiography and PCI produces
expose patient to an average DAP in the range of 20 to 106 Gy*cm² and 44 to 143 Gy*cm² respectively.
Dose (biochemistry)
A dose is a quantity of something that may impact an organism biologically; the greater the quantity, the larger the dose. In nutrition, the term is usually applied to how much of a specific nutrient is in a person's diet or in a particular food, meal, or dietary supplement...
within the radiation field but also the area of tissue
Tissue (biology)
Tissue is a cellular organizational level intermediate between cells and a complete organism. A tissue is an ensemble of cells, not necessarily identical, but from the same origin, that together carry out a specific function. These are called tissues because of their identical functioning...
irradiated. Therefore, it may be a better indicator of the overall risk of inducing cancer than the dose within the field. It also has the advantages of being easily measured, with the permanent installation of a DAP meter on the X-ray set. DAP is expressed in Gray
Gray (unit)
The gray is the SI unit of absorbed radiation dose of ionizing radiation , and is defined as the absorption of one joule of ionizing radiation by one kilogram of matter ....
square centimetres
Square metre
The square metre or square meter is the SI derived unit of area, with symbol m2 . It is defined as the area of a square whose sides measure exactly one metre...
(Gy*cm²) (sometimes mGy*cm² or cGy*cm²). Manufacturers of DAP meters usually calibrate them in terms of absorbed dose to air.
Kerma area product (KAP) is a related quantity which for all practical radiation protection purposes is equal to dose area product. However, strictly speaking DAP = KAP x (1-g) where g is the fraction of energy of liberated charged particles that is lost in radiative processes in the material, and the dose is expressed in absorbed dose to air. The value of g for diagnostic X-rays is only a fraction of a percent.
Coronary angiography and PCI produces
Percutaneous coronary intervention
Percutaneous coronary intervention , commonly known as coronary angioplasty or simply angioplasty, is one therapeutic procedure used to treat the stenotic coronary arteries of the heart found in coronary heart disease. These stenotic segments are due to the build up of cholesterol-laden plaques...
expose patient to an average DAP in the range of 20 to 106 Gy*cm² and 44 to 143 Gy*cm² respectively.