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focus to skin distance

focus to skin distance  

(fsd)The distance between the focal spot of the x-ray tube (where x-rays are produced) marked with a red dot on the intra-oral x-ray head to the skin surface of the patient. For the long cone ...
paralleling technique

paralleling technique  

A method of taking an intra-oral radiograph in which the film is held in a film holder parallel to the tooth and the x-ray beam is directed at 90° to the tooth and the film. A 20cm focus to skin ...
focus to skin distance

focus to skin distance   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
54 words

...focus to skin distance ( fsd ) The distance between the focal spot of the x-ray tube (where x-rays are produced) marked with a red dot on the intra-oral x-ray head to the skin surface of the patient. For the long cone paralleling technique the fsd must be at least 20...

controlled area

controlled area   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
62 words

...controlled area An area within the primary x-ray beam (until it has been sufficiently attenuated by distance or shielding) and within 1.5m of the x-ray tube and the patient in any other direction whilst x-rays are being generated. No one other than the patient should be within the controlled area during an exposure. http://www.whaitesessentialsdentalradiography.com/downloads/Essentials%20Radiation%20Protection%20Guidance.pdf Summary of current UK legislation and...

collimation

collimation   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
79 words

... n. The elimination of divergent x-rays by using a metal tube, cone, or diaphragm ( collimator ) to produce a narrow beam directed specifically at the radiograph. Collimation gives the final shape and size of the x-ray beam. Legally in the UK the beam must be no more than 6cm in diameter. Rectangular collimation should be provided on new equipment and fitted to existing equipment at the earliest opportunity. http://www.whaitesessentialsdentalradiography.com/downloads/Essentials%20Radiation%20Protection%20Guidance.pdf Summary of current UK...

systemic inflammatory response syndrome

systemic inflammatory response syndrome   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
80 words

...response syndrome ( SIRS ) Severe systemic sepsis . The diagnosis requires two or more of a group of signs: temperature greater than 38ºC or less than 36ºC; heart rate over 90 beats per minute; respiratory rate of over 20 breaths per minute or P a CO 2 of less than 4.3kPa; and white cell count of over 12x10 9 /L or under 4x10 9 /L. There is some debate as to whether this terminology is...

paralleling technique

paralleling technique   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
78 words

...paralleling technique A method of taking an intra-oral radiograph in which the film is held in a film holder parallel to the tooth and the x-ray beam is directed at 90° to the tooth and the film. A 20cm focus to skin distance is required to ensure that the x-ray beam is parallel rather than divergent. It gives less geometric distortion than the bisecting angle technique and allows the use of rectangular collimation...

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