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GB/T 24791.3-2009: Photography -- Sensitometry of screen/film systems for medical radiography -- Part 3: Determination of sensitometric curve shape, speed and average gradient for mammography
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Photography -- Sensitometry of screen/film systems for medical radiography -- Part 3: Determination of sensitometric curve shape, speed and average gradient for mammography
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GB/T 24791.3-2009
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Basic data | Standard ID | GB/T 24791.3-2009 (GB/T24791.3-2009) | | Description (Translated English) | Photography -- Sensitometry of screen/film systems for medical radiography -- Part 3: Determination of sensitometric curve shape, speed and average gradient for mammography | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G80 | | Classification of International Standard | 37.040.25 | | Word Count Estimation | 17,181 | | Date of Issue | 2009-12-15 | | Date of Implementation | 2010-06-01 | | Quoted Standard | ISO 554-1976; GB/T 11501; GB/T 11500 | | Adopted Standard | ISO 9236-3-1999, IDT | | Regulation (derived from) | National Standard Approval Announcement 2009 No.15 (Total No.155) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the characteristics of the light-sensitive breast X -ray screen/film/film clip/processing system curve shape, determination of average slope and sensitivity. Film clip can be in any form, just make sure the screen/film in close contact to prevent the film is exposed to ambient light. A film holder can be frequently used in the real face of the vacuum light does not leak, or X -ray cassette for use in breast imaging X -ray photographic process. | GB/T 24791.3-2009: Photography -- Sensitometry of screen/film systems for medical radiography -- Part 3: Determination of sensitometric curve shape, speed and average gradient for mammography
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Photography.Sensitometry of screen/film systems for medical radiography.Part 3. Determination of sensitometric curve shape, speed and average gradient for mammography
ICS 37.040.25
G80
National Standards of People's Republic of China
GB/T 24791.3-2009/ISO 9236-3.1999
Photography Medical X-ray imaging with screen/film system
Sensitometry Part 3. breast X-ray imaging
Photosensitive characteristic curve shape, speed and
Determine the average slope
(ISO 9236-3.1999, IDT)
Posted 2009-12-15
2010-06-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This part identical with ISO 9236-3.1999 "photography medical X-ray imaging measurement - Part 3 photosensitive screen/film system.
The shape of the breast X-ray imaging sensitivity characteristics curves, speed and average gradient measurement "(in English).
This section is equivalent translation ISO 9236-3.1999.
For ease of use, this section made the following editorial changes.
a) "this International Standard" be replaced by "this section";
b) use a decimal point instead of a decimal comma ",". ",";
c) amend the foreword and introduction.
This section of the Appendix A, Appendix B is an informative annex.
This part is proposed by the China Petroleum and Chemical Industry Association.
This part of the photosensitive material by the National Standardization Technical Committee (SAC/TC102) centralized.
This section drafted by. China Lucky Film Group Corporation.
The main drafters of this section. Lili, Zhang.
GB/T 24791.3-2009/ISO 9236-3.1999
Introduction
This standard consists of the following sections.
Part 1. photosensitive characteristic curve shape, speed and average gradient measurement.
Part 2. Determination of the modulation transfer function (MTF) of.
Part 3. breast X-ray imaging of the photosensitive characteristic curve shape, speed and average gradient measurement.
The standard medical X-ray imaging characteristic shape with photosensitive screen/film/holder/processing system curve average slope sensitivity
test methods.
Photosensitive other performance characteristic measurement is carried out when needed (e.g. Modulation Transfer Function), the photosensitive characteristic curve in the low scattering conditions
By using X-ray intensity scale photographic measurement technology, the best is to use the inverse square of the photosensitive measured. In order to determine the characteristic curve of the photosensitive shape
Like, need to screen/film/holder combination body irradiation were measured.
The average slope of the characteristic curve through the photosensitive shape drawn, you must use a separate method sensitivity was measured exposure conditions should be as
You can simulate the actual application. Therefore, compared with the dimmer used in making photographic measurement of light quality, the composition of the scattered light is accompanied by the quality of light
Slight changes. The clinical application of exposure is appropriate phantom voltage analog and tube made. Screen/film/holder combination after molding into the body
Line exposure. To determine the sensitivity, exposure should be in absolute units Gy (Gy) were measured.
Typically it depends on the sensitivity of X-ray energy, the exposure time and the amount of scattered light. Therefore, in practical application, the size varies sensitivity
Variety. As used in screen/film mammography tube voltage range is small, but this standard describes a method for determining the speed of a time
Kinds of light quality. The use of the standard measurement conditions can calculate the size of the average slope sensitivity, providing for the practical application
in accordance with.
GB/T 24791.3-2009/ISO 9236-3.1999
Photography Medical X-ray imaging with screen/film system
Sensitometry Part 3. breast X-ray imaging
Photosensitive characteristic curve shape, speed and
Determine the average slope
1 Scope
Photosensitive characteristic curve shape this part of GB/T 24791 describes a breast X-ray screen/film/holder/processing system, and the average slope
Determination of sensitivity.
The film holder can be any form, just make sure screen/film in close contact to prevent the film is exposed to ambient light. The film holder can be a
Light does not leak vacuum bag frequently used in the experiment, or X-ray imaging cartridge for use in breast X-ray photographic process.
Note. In the following screen/film/holder combination called "combination" When included processing system, known as the "system."
2 Normative references
The following documents contain provisions which, through reference GB/T 24791 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section. However, under this part are encouraged to reach
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 11500 photographic density measurements - Part 2. Geometric conditions (GB/T 11500-2008, ISO 5-2.2001, IDT)
GB/T 11501 photographic density measurements - Part 3. Spectral conditions (GB/T 11501-2008, ISO 5-3.1995, IDT)
ISO 554. 1976 standard atmospheric conditions and/or test specifications
3 Terms and Definitions
The following terms and definitions apply to this section.
3.1
The sum of the initial kinetic energy of all charged particles (such as electrons) released from the Central African air molecules charged particles (such as X-ray photons), divided by the release
Air quality charged particles. Unit is Gy (Gy).
3.2
Logarithmic function of density and exposure of the film developing process after the correspondence between the curves.
3.3
In particular exposing, processing and density measurement conditions, screen/film systems for the quantitative measurement of radiation energy response.
3.4
On the photosensitive characteristic curve slope of the line connecting two specific points.
3.5
Film exposure, after subtracting the density of developed film density of the unexposed and developed.
GB/T 24791.3-2009/ISO 9236-3.1999
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