|
US$349.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
WS 523-2019: Specification for testing of quality control in gamma cameras and single photon emission computed tomograph (SPECT)
Status: Valid WS 523: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| WS 523-2019 | English | 349 |
Add to Cart
|
4 days [Need to translate]
|
Specification for testing of quality control in gamma cameras and single photon emission computed tomograph (SPECT)
| Valid |
WS 523-2019
|
| WS/T 523-2019 | English | 329 |
Add to Cart
|
3 days [Need to translate]
|
(Gamma camera, single photon emission tomography equipment (SPECT) quality control inspection specifications)
| |
WS/T 523-2019
|
PDF similar to WS 523-2019
Basic data | Standard ID | WS 523-2019 (WS523-2019) | | Description (Translated English) | Specification for testing of quality control in gamma cameras and single photon emission computed tomograph (SPECT) | | Sector / Industry | Health Industry Standard | | Classification of Chinese Standard | C57 | | Classification of International Standard | 13.280 | | Word Count Estimation | 15,171 | | Date of Issue | 2019 | | Date of Implementation | 2019-07-01 | | Issuing agency(ies) | National Health Commission | WS 523-2019: Specification for testing of quality control in gamma cameras and single photon emission computed tomograph (SPECT)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Specification for testing of quality control in gamma cameras and single photon emission computed tomograph (SPECT)
ICS 13.280
C 57
WS
People's Republic of China Health Industry Standard
Gamma camera, single photon emission tomography device
(SPECT) Quality Control Test Specification
Specification for testing of quality control in gamma cameras and single photon
Emission computed tomograph(SPECT)
Published on.2019 - 01 - 25
2019 - 07 - 01 implementation
National Health and Wellness Committee of the People's Republic of China
Content
Preface II
1 Scope 1
2 Terms and Definitions 1
3 Quality Control Testing Requirements 2
4 Quality Control Testing Projects and Methods 3
Appendix A (Normative Appendix) Quality Control Testing Project and Technical Requirements 9
Reference 10
Foreword
Chapter 3 and Appendix A of this standard are mandatory, and the rest are recommended.
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was drafted. Radiation Protection and Nuclear Safety Medical Institute of China Center for Disease Control and Prevention, Cancer Hospital of Chinese Academy of Medical Sciences, Qing
Hua University, Guangdong Provincial Occupational Disease Prevention and Treatment Institute.
The main drafters of this standard. An Jinggang, Yan Jianhua, Jin Yongjie, Liu Liming, Yang Haoxian, Huang Weixu.
Gamma camera, single photon emission tomography (SPECT) quality control test specification
1 Scope
This standard specifies the gamma camera, single photon emission tomography equipment (SPECT) quality control testing requirements, testing items and methods
law.
This standard applies to the quality control detection of gamma camera rotary SPECT based on NaI crystal.
In addition to the spatial resolution of the fault and the spatial resolution of the whole body imaging system, other indicators are applicable to the quality control of gamma cameras.
System testing.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Energy window
The energy range of gamma rays and X rays that are acceptable and processed. The window can use an energy range (eg 130 keV to 151 keV) or
The percentage of the peak (such as 15% of 140 keV) is expressed. When expressed as a percentage, the energy peak should be given and the window is centered on the energy peak.
Symmetrical, such as a 140 keV 20% energy window is equivalent to 126 keV to 154 keV.
2.2
Full width at half maximum (FWHM)
On a bell curve, the height of the ordinate is half the maximum value, parallel to the distance between two points on the abscissa.
2.3
Spatial resolution
The ability to accurately distinguish between two radioactive point sources in space. Expressed by the full width at half maximum (FWHM) of the point source or line source extension function.
2.4
Intrinsic spatial resolution
The spatial resolution measured without a collimator is called the intrinsic spatial resolution;
2.5
System spatial resolution
The spatial resolution measured with a collimator is called the spatial resolution of the system.
2.6
Tooth space spatial resolution
Spatial resolution of tomographic systems.
2.7
Whole body system spatial resolution
The spatial resolution of a whole body scanning imaging system.
2.8
Intrinsic integral uniformity
With no collimator, the uniformly incident gamma rays have the largest change in count density over a given area over the entire field of view of the probe.
2.9
Intrinsic differential uniformity
With no collimator, the uniformly incident gamma rays have the largest change in count density over a small interval within the field of view of the probe.
2.10
Intrinsic spatial differential linear instrinsic spatial differential linearity
The degree of variation in the offset between the line source image position and the actual position of the line source without the collimator.
2.11
Intrinsic space absolute linear instrinsic spatial absolute linearity
The maximum offset of the actual position of the line source and the image position in the X and Y directions in the field of view without the collimator.
2.12
System planar sensitivity
The ratio of the plane source count rate to the activity observed for the probe for a particular collimator.
Note. The unit is per megabeck per second.
2.13
Effective field of view (UFOV)
The probe is used in the range of gamma ray and X-ray imaging, the size of which is given by the manufacturer.
2.14
Central field of view (CFOV)
The effective field of view shrinks 12.5% of the area in the center direction.
3 Quality control testing requirements
3.1 The gamma camera and SPECT user unit shall formulate a quality assurance plan including the quality control test plan and ensure its correct implementation.
Test according to the quality control inspection plan and the requirements of this standard.
3.2 Newly installed or overhauled gamma cameras and SPECTs should be inspected by a technical service organization with testing qualification before being put into use.
Acceptance test shall be carried out according to the factory standard for the passing of the test indicators, and the indicators equal to or better than the factory standards shall be judged as qualified.
It can be activated only after confirming that all the test indicators are qualified. The items and technical requirements for acceptance testing shall comply with the provisions of Appendix A and 3.4.
3.3 The gamma camera, SPECT and its associated equipment in use should be regularly maintained and calibrated. The status detection period is one year.
Qualified technical service agencies test it. Stability testing is performed by the organization itself or by an agency that has the ability to detect. response
The test indicator is qualified or not, and the indicator equal to or better than the specified value is judged as qualified. State detection and stability testing projects,
The cycle and technical requirements are as specified in Appendix A.
3.4 In the acceptance test, when the use unit and the supplier have a different agreement than 3.2, they can also be executed according to the agreement, but the test in the agreement
The project shall not be less than the items specified in Table A.1, and the requirements of each item shall not be lower than the requirements of Table A.1.
3.5 The measuring instrument for testing shall be calibrated or calibrated according to the relevant regulations, and the testing phantom shall comply with the relevant requirements.
3.6 The technical manuals and test records of the equipment manual, instruction manual, etc. should be properly stored.
3.7 The basic content of the test report shall include. basic information and equipment information of the unit under inspection, and relevant tests shall be given in accordance with the requirements of this standard.
Indicators and test methods, necessary test conditions, test results and their corresponding standard requirements.
3.8 Before the quality control test, the following parameters should be set or confirmed.
a) Unless the manufacturer has special instructions, the energy peak is generally set to 140 keV, and the energy window is set to 20%;
b) Before the test, check the background count rate and energy peak with the collimator. Unless the manufacturer has special instructions,
The background count rate should be no more than 2.03103 min-1, and the peak deviation (using 99Tcm nuclide) should be no more than ±3 keV.
4 Quality Control Testing Projects and Methods
4.1 Inherent uniformity
4.1.1 Test conditions
The source used for the test is a 99Tcm solution, which is placed in a test tube or a small ampule. The source has a size of no more than 5 mm in all directions and an activity of about 20 MBq.
Make the count rate not more than 2.03104s-1. The source should be placed 5 times the center of the probe surface at the position of the maximum line diameter of the field of view.
4.1.2 Data Collection
Generic image data acquisition. Remove the collimator, set the total acquisition count and image matrix to ensure the center pixel count of the acquired image
At least 1.03104.
4.1.3 Data Processing
Before performing the homogenization calculation, the included pixels should be determined as follows.
a) UFOV edge pixels, 50% of the pixel area is not in the UFOV, should not be included in the uniformity calculation;
b) pixels around UFOV, if the pixel count is less than 75% of the average value in CFOV, the value should be set to 0;
c) pixels in the field of view, if the pixel has a value of 0 in the positive direction of the positive direction, the pixel value is set to 0;
d) The remaining non-zero-valued pixels processed by a) to c) above will participate in the UFOV analysis and perform 9-point smoothing and 9-point smoothing.
The filter matrix is as follows;
e) The above processes a) to d) are only operated once. The data processing of CFOV can be performed with reference to UFOV.
Inherent integral uniformity.
In the processed pan-source image, find the maximum and minimum values of the pixel values in UFOV and CFOV, respectively, and calculate the difference between the two.
For the difference and sum, calculate the integral uniformity according to equation (1).
IU=[(Cmax-Cmin)/(Cmax Cmin)]3100% ...(1)
In the formula.
IU -- inherent integral uniformity;
Cmax -- the maximum value of the pixel;
Cmin -- the minimum value of the pixel.
Inherent differential uniformity.
In the processed pan-source image, differential uniformity is calculated in UFOV and CFOV, respectively. Starting from the beginning of the pixel row and column,
Moving forward pixel by pixel, each adjacent 5 pixels is a group, find the maximum pixel value and the minimum pixel value, and calculate the difference and sum between the two.
Value, calculate the percentage value according to formula (2). The maximum percentage in the X and Y directions is differential uniformity.
DU= (Cmax-Cmin)/(Cmax Cmin)3100% ...(2)
In the formula.
DU -- inherent differential uniformity;
Cmax -- the maximum value of the count;
Cmin -- counts the minimum value.
4.2 Inherent spatial resolution
4.2.1 Slit lead grid method
4.2.1.1 Test conditions
The source used for the test is a 99Tcm solution, which is contained in a test tube or a small ampule, and the activity is about.200 MBq to 400 MBq, so that the counting rate is not more than 23
-1, the source is more than 1.5 m from the center of the probe surface.
4.2.1.2 Data collection
Remove the collimator and use the slit lead grid phantom for image acquisition. The slit lead grid body is composed of 1 mm wide and 30 mm slits, and the thickness of lead is thick.
The degree is not less than 3 mm, one lead grid model is in the X direction, and the other lead grid model is in the Y direction (see Figure 1). Remove the collimator from the probe and set it
The slit lead gate body is on the surface of the probe such that the gate slit of the lead gate pattern body is parallel to the X-axis and the Y-axis of the probe, respectively, to detect the space in both the Y and X directions.
Resolution. The acquisition matrix 5123512 (or the largest matrix that can be reached). The total count collected should be guaranteed to extend the line during later data processing
The center peak of the function is not less than 13103 counts.
Note 1. The area of the lead grid should be larger than the field of view of the probe.
Note 2. The slit width is 1.0 mm.
Note 3. The distance between the slits is 30 mm, and the lead thickness is not less than 3 mm.
Figure 1 Slit lead grid body
4.2.1.3 Data Processing
The data processing process is as follows.
a) In order to ensure the accuracy of the line expansion function, the sampling of each slit direction should be equal to or less than 0.2 FWHM, parallel to the slit direction
The sampling is equal to or less than 30 mm.
b) When calculating the line expansion function, if the acquired data is a two-dimensional matrix, the data should be parallel to the direction of the slit not more than 30 mm.
The superposition forms a one-dimensional line extension function. Find the corresponding peak position, peak value and full width at half maximum for each line extension function in pixels
(FWHM).
c) Convert the pixel units to distance units in mm. Applying the average value (pixel unit) of the peak difference of the line-of-field extension function and the phantom
The conversion distance of the pixel distance can be obtained by the known distance between the slits (30 mm).
d) Calculate the average of the FWHM of the UFOV and CFOV X and Y directions, respectively, and report the spatial resolution of the probe in units of
Mm, the value is accurate to 0.1 mm.
4.2.2 Four-quadrant lead grid method
4.2.2.1 Test conditions
Same as 4.2.1.1.
4.2.2.2 Data collection
All lead seams are 1mm wide
30mm
Measuring Y-direction resolution lead grid measurement X-direction resolution lead grid
Lead grid detail
The collimator was removed and the four-quadrant lead grid phantom was used for image acquisition. The four-quadrant lead grid line widths are 2 mm, 3 mm, 3.5 mm, and 4 mm, respectively.
The line width should ensure that at least one of the line widths in the test image is not fully resolved. Remove the collimator from the probe and place the lead grid on the probe surface.
The grid slits of the lead grid phantom are parallel to the X and Y axes of the probe, respectively, to detect spatial resolution in both the Y and X directions. Acquisition matrix 5123512
(or the largest matrix that can be reached). The total count collected was 63104. Rotate the lead grid 90°, 180°, 270°, and then flip the lead grid once,
Repeatedly capture 4 images at different angles and collect 8 images.
4.2.2.3 Data Processing
Visually determine the smallest lead grid size that can be resolved. The resolution half width is the minimum resolution size multiplied by 1.75. Calculate the X and Y directions
average value.
4.2.3 Method selection
In the acceptance test and state detection, the slot lead grid method should be used; when the stability test is used, the four-quadrant lead grid method can be used.
Slot lead grid method.
4.3 Intrinsic spatial linearity
4.3.1 Slit lead grid method
4.3.1.1 Test conditions
Same as 4.2.1.1.
4.3.1.2 Data collection
Same as 4.2.1.2.
4.3.1.3 Data Processing
Data processing should be determined as follows.
a) the line extension function, the acquisition of the peak position of the line extension function, and the conversion of the pixel and the distance are the same as in 4.2.1.3;
b) Determination of the physical location of the line source. The position of the slit on the image of the lead gate phantom can be approximated by the peak position of several lines on the same slit.
The curve is replaced. The fitting method is a least squares method;
c) the fitting curve is to be performed on all slits;
d) The maximum deviation between the peak position of the line extension function and the fitted curve is absolute linear, and the standard deviation of the peak position difference of the line spreading function is the opposite line.
Sex
e) The spatial linearity is the average of the two directions X and Y, and UFOV and CFOV are reported separately, in mm, to the nearest
0.01 mm.
4.3.2 Four-quadrant lead grid method
4.3.2.1 Test conditions
Same as 4.2.1.1.
4.3.2.2 Data collection
Same as 4.2.1.2.
4.3.2.3 Data Processing
Visually determine if there is linear distortion.
10mm 20mm
4.3.3 Method selection
In the acceptance test and state detection, the slot lead grid method should be used; when the stability test is used, the four-quadrant lead grid method can be used.
Slot lead grid method.
4.4 Intrinsic maximum count rate
4.4.1 Test conditions
The nuclides used were 99Tcm solution with a activity of about 37 MBq and placed at a distance of more than 2 m from the center of the probe surface.
4.4.2 Data Collection
Remove the collimator from the probe, place the probe perpendicular to the ground, and place the source at a distance of more than 2 m from the center of the probe surface. Set the device to
Static acquisition mode, the size of the acquisition matrix is not limited. After starting the acquisition, observe the radioactive source count rate from the display, when the radioactive source is perpendicular to the probe table.
When the surface gradually moves from the far position to the probe surface, the count rate changes, first becoming larger and then smaller.
4.4.3 Data Processing
The maximum count rate will be reached when the source moves to a location. The maximum count rate is the maximum count rate in s-1.
4.5 System plane sensitivity
4.5.1 Test conditions
The source used for the measurement was a 99 Tcm solution with an activity of approximately 40 MBq. Accurately measure activity A with a viability meter and note the activity time t activity.
Place the accurately measured 99Tcm solution into a flat sensitivity phantom (flat plastic disc with an inner diameter of 15 cm, as shown in Figure 2) and add to 2 mm to 3 mm
High water.
170mm
150mm
Figure 2 System plane sensitivity phantom
4.5.2 Data Collection
A low-energy general-purpose or low-energy high-resolution collimator is mounted on the probe to perform static image acquisition on the planar sensitivity phantom. Close uniformity school
Quasi-function. Set the system plane sensitivity to the center of the probe, 10 cm from the surface of the collimator. Acquisition conditions. acquisition matrix 2563256,
Acquisition time T is collected for 5 min. Accurately record the time t at which the acquisition starts and the total image count N. The above data collection should be no less than 3 times and the result is
The average of 3 acquisitions.
4.5.3 Data Processing
Calculate the system plane sensitivity according to equation (3).
Acquisition activity 1/2 Acquisition 1/2
[( ) ln 2/ ] ( ln 2/ ) -1 -1
1/2
(ln 2/ ) [1 - ]
t -t T -TT
S = N e T e A ...(3)
100mm
In the formula.
S - system plane sensitivity in megahertz per second (s-12MBq-1);
N - total count;
collection
t -- the time of image acquisition, in seconds (s);
activity
t -- the time at which the net activity A is measured, in seconds (s);
1/2
T -- the half life of the radionuclide in seconds (s);
collection
T -- the acquisition duration of the image in seconds (s);
A -- The net activity of the radionuclide injected into the phantom in megabeltz (MBq).
4.6 System Spatial Resolution
4.6.1 Test conditions
The phantom used for the test is a parallel two-line source phantom (see Figure 3). The source is a 99Tcm solution with a volume of about 1 ml and an activity of about 74 MBq.
The measured count rate is not more than 2.03104 s-1.
Note 1. The line source width is not more than 1 mm;
Note 2. The thickness of the plexiglass plate is 10 mm.
Figure 3 Parallel two-line source phantom
4.6.2 Data Collection
Two-line source phantom image acquisition. Probe with low-energy general-purpose or low-energy high-resolution collimator, acquisition matrix 5123512 (or maximum achievable)
matrix). Place the parallel two-wire source phantom (see Figure 3) at a distance of 10 cm from the probe collimator surface and hang it over. Line source phantom should be located
The center is parallel to the X and Y directions of the probe. The total count of each probe acquisition is not less than 13106.
4.6.3 Data Processing
400mm
If the data acquired by the line spread function is a two-dimensional matrix, the data expansion of no more than 30 mm parallel to the slit direction should be formed to form a line expansion.
function. For each line extension function, find the peak and peak positions in pixels, and find the full width at half maximum. Pixel to millimeter calibration factor for
Convert the full width at half maximum to millimeters. The spatial resolution report should take the average of the spatial resolution in the X and Y directions, at least to the nearest 0.1 mm.
4.7 Fault spatial resolution
4.7.1 Detection conditions
Preparation of point source. A 99 Tcm solution of high specific activity was used to detect the source used. Put the solution into the test tube and use the capillary tube (the inner diameter is not large)
A small drop of 99Tcm solution was taken at 1 mm), the length was not more than 1 mm, and the count rate was not more than 2.03104 s-1.
4.7.2 Data Collection
Point source tomography image acquisition. SPECT with low-energy high-resolution collimator, point source suspended in the center of the axial and lateral fields of view (deviation less than 2
Cm), radius of rotation 15 cm. Fault acquisition conditions. matrix is not less than 1283128, 120 frames (3 °/frame), 33103 count/frame.
4.7.3 Data Processing
The image reconstruction method is the filtered back projection method (FBP), and the filter function uses RAMP. If other reconstruction methods are used, it should be in the report.
Note.
Calculate the full width at half maximum of the point source image after reconstruction, in mm, at least to 0.1 mm. Report cross-sectional spatial resolution (point source map)
Like the average of the full width at half maximum in the X and Y directions) and axial spatial resolution.
4.8 Whole body imaging system spatial resolution
4.8.1 Test conditions
The test conditions are the same as 4.6.1.
4.8.2 Data Collection
Parallel two-line source phantom body image acquisition. Whole-body imaging system spatial resolution is to detect SPECT vertical and parallel to the direction of motion
The resolution. SPECT with low energy high resolution collimator. Place the parallel two-wire source phantom on the inspection bed and make the line source parallel and vertical
In the direction of motion of the scanning bed, the center point of one of the line sources coincides with the center point of the scanning bed, and the line source is 10 cm away from the collimator. Pick
Set matrix 25631024, scanning length 195 cm; using continuous walking bed acquisition mode, the bed speed is set to 15 cm/min.
4.8.3 Data Processing
If the acquired data is a two-dimensional matrix, it should be formed by superimposing data parallel to the direction of the line source to form a line expansion with a width of no more than 30 mm.
function. The extension function for each line is in pixels, the maximum value and the adjacent two points are determined by parabola fitting method, and the peak is half adjacent.
The point is determined by linear interpolation to determine the half-height position and to calculate the full width at half maximum. Calculated in mm, at least to the nearest 0.1 mm
The average of the spatial resolution perpendicular to and parallel to the direction of motion.
Appendix A
(normative appendix)
Quality control testing items and technical requirements
Gamma cameras, SPECT inspection items and technical requirements shall comply with the requirements of Table A.1.
Table A.1 Quality Control Testing Items and Technical Requirements
Serial number detection item
Acceptance test
Claim
State detection
Claim
Stability test
Request cycle
1 inherent uniformity
Integral uniformity
UFOV factory indicator ≤5.5% ≤5.5%
one week
CFOV factory indicator ≤4.5% ≤4.5%
Differential uniformity
UFOV factory indicator ≤3.5% ≤3.5%
CFOV factory indicator ≤3.0% ≤3.0%
2 inherent spatial resolution/mm
UFOV factory indicator ≤ 5.4 ≤ 5.4
Six months
CFOV factory indicator ≤ 5.4 ≤ 5.4
3 inherent space linearity/mm
Differential linearity
UFOV factory indicator ≤0.24 ≤0.24
Six months
CFOV factory indicator ≤0.24 ≤0.24
Absolute linearity
UFOV factory indicator ≤0.84 ≤0.84
CFOV factory indicator ≤0.60 ≤0.60
4 system plane sensitivity/(s-12MBq-1) factory indicator ≥ 60 ≥ 60 six months
5 inherent maximum count rate/s-1 factory indicator ≥ 673103 ≥ 673103 six months
6 system spatial resolution/mm factory indicators - - -
7 Fault spatial resolution/mm Factory index ≤ 18.7 - -
8 Whole body imaging system spatial resolution/mm Factory index ≤ 15.4 - -
Note 1. For multi-probe SPECT systems, in addition to the fault spatial resolution project, the test results for each probe should be given in the test report.
Note 2. The thickness of the probe crystal is indicated in the report; for the project requiring collimator detection, it is recommended to use a low-energy high-resolution collimator, and the collimator used.
The type should be noted in the report.
references
[1] NEMA NU 1-2007 Performance Measurements of Gamma Cameras
[2] IAEA HUMAN HEALTH SERIES No.6 Quality Assurance for SPECT Systems
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of WS 523-2019_English be delivered?Answer: Upon your order, we will start to translate WS 523-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of WS 523-2019_English with my colleagues?Answer: Yes. The purchased PDF of WS 523-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay. Question 5: Should I purchase the latest version WS 523-2019?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version WS 523-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.
|