TSD


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distance

(dis'tans) [L. distantia, remoteness]
The space between two objects.

focal distance

In ophthalmology, the distance from the optical center of a lens to the focal point.

focal-film distance

Abbreviation: FFD
Focus-film distance.

focus-film distance

Abbreviation: FFD
In radiography, an obsolete term for source-to-image receptor distance.
Synonym: focal-film distance See: source-to-image receptor distance

hearing distance

The distance at which a given sound can be heard.

infinite distance

1. A distance without limits.
2. In ophthalmology, the assumption that the light rays coming from a point of a distance beyond 20 ft (6.1 m) are practically parallel and accommodation is unnecessary.

interocclusal distance

The distance between the occlusal surfaces of opposed teeth when the mandible is at rest.

interocular distance

In ophthalmology, the distance between the eyes.
See: hypertelorism

interpupillary distance

In ophthalmology, the distance between the centers of the pupils of the eyes.

margin crease distance

In ophthalmology, the height that the crease of the eyelid sits above the upper eyelid margin when the eye is positioned in primary gaze.

object-film distance

Abbreviation: OFD
In radiography, an obsolete term for object-image receptor distance.

object-image receptor distance

Abbreviation: OID
In radiography, the distance between the anatomical structure to be imaged and the radiographic image receptor.

source-object distance

Abbreviation: SOD
In radiography, the distance between a source of radiation and the object that it images or radiates.

source-skin distance

In radiography, the distance from a radiation source to a patient's skin.

source-to-image receptor distance

Abbreviation: SID
In radiography, the distance from the x-ray tube to the radiographical film or the image receptor.

target-skin distance

Abbreviation: TSD
1. In radiography, the distance from the source of radiation to the point where the beam enters the patient.
2. In radiation therapy, a common value used for determination of the depth at which the treatment time is calculated.

target-skin distance

Abbreviation: TSD
1. In radiography, the distance from the source of radiation to the point where the beam enters the patient.
2. In radiation therapy, a common value used for determination of the depth at which the treatment time is calculated.
See also: distance
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
He also warned TSD operators to strictly comply with the environmental regulations or face appropriate consequence or penalties.
TSD was significantly higher in females (p=0.03) (Table-I).
According to us, what makes TSD rallies so important is the fact that literally anyone with a drivers license can take part in them.
To identify TSD carriers by use of an enzymatic assay, the combined activities of HEXA and HEXB, as well as the activity of HEXB after heat-inactivation of HEXA, are determined.
TSD Wellness will provide comprehensive support, from contract research organization (CRO) services to developing marketing strategies.
At day 14, the response rates were 22% in the TSD plus paroxetine group, 41% for the TSD plus placebo group, and 46% for the paroxetine and sleep reduction group; the differences were not significant.
for several years until 1998, says, "We've put our company in a position to assist both industrial users and former TSD distributors." Norton notes that Smith's engineering VP, Lee Flick, was a toolholder design engineer for TSD from 1986 until 1999.
The joint venture company is called TSD Integrated Controls.
The new tax shelter disclosure (TSD) regulations do not alter substantive tax rules, but rather attack the problem by requiring persons participating in corporate tax shelter transactions to create, maintain, and provide to the IRS certain information about the transactions and persons associated with the transactions.
First (FSD), second (SSD), and third (TSD) degree stochastic dominance tests are run on the two groups.
* Corrective actions at treatment, storage, and disposal (TSD) facilities regulated under the Resource Conservation and Recovery Act (RCRA)(3)