Vietnam: Compilation of the technical requirements for linear accelerator machines used in radiation therapy

14:50, 11/07/2024

On December 5, 2017, the Ministry of Science and Technology of Vietnam issued Circular 15/2017/TT-BKHCN regarding the National Technical Regulation for Linear Accelerators used in Radiotherapy.

According to Circular 15, linear accelerators used in radiotherapy must meet the following requirements:

No.	Inspection Content	Technical Requirements
I	External Inspection	- The radiotherapy linear accelerator to be inspected must be in working condition. - The radiotherapy linear accelerator and control console must be clean, free of rust, cracks, or deformation.
II	Technical Inspection
1	Control Console Inspection	- The switches on the control console must function properly and move smoothly; - Indicator lights on the control console must accurately reflect the operating status of the linear accelerator.
2	Linear Accelerator Operation Inspection	- The linear accelerator arm must rotate smoothly around its axis and be able to stop at any position. - The beam collimator of the linear accelerator must rotate easily around its axis and stop at any position. - MLC leaves or jaws can move easily under control to create the required radiation field. - The light field size indicator must be clearly visible. - Mechanical distance measurement systems, optical indicators, and laser systems must be clearly visible. - The emergency stop system allows stopping irradiation from the control console, and resuming irradiation after stopping can only be done from the control console. - The interlock system operates stably.
III	Measurement Inspection
A	Mechanical System Accuracy Inspection
1	Accuracy of Optical Indicator Ruler	± 2 mm
2	Accuracy of Rotation Angle Display in the Beam Collimator System, Arm, and Treatment Table	± 1°
3	Congruence of Light Field and Radiation Field Size	± 3 mm for field sizes ≤ (200 mm x 200 mm); ± 5 mm for field sizes > (200 mm x 200 mm) ± 2 mm deviation of the radiation field center from the crosshair center
4	Laser Beam Accuracy at the Isocenter	± 2 mm
5	Accuracy in the Treatment Table Movement	± 2 mm
B	Photon Beam Radiation Dose Inspection
6	Photon Beam Quality (TPR₂₀_/1₀)	± 2% compared to the TPR_20/10 or PDD_20/10 value at the time of commissioning
7	Photon Beam Output Dose Calibration	1 cGy/MU ± 2%
8	Output Dose Factor according to Field Size	± 2% compared to the output dose factor value at the time of commissioning
9	Field Flatness (F) and Symmetry (S)	± 3%
10	Transmission Factor of Wedge (Physical Wedge)	± 2% compared to the transmission factor value at the time of commissioning
C	Electron Beam Radiation Dose Inspection
11	Electron Beam Quality (R₅₀)	± 2 mm compared to the R₅₀ value at the time of commissioning
12	Electron Beam Output Dose Calibration	1 cGy/MU ± 2%
13	Output Dose Factor for Electron Beam Applicators	± 2% compared to the output dose factor value at the time of commissioning
14	Field Flatness (F) and Symmetry (S) for Electron Beam	F ≤ ± 6% for energies less than 10 MeV; F ≤ ± 4% for energies greater than 10 MeV S ≤ ± 3%
D	Multi-Leaf Collimator (MLC) Inspection
15	Accuracy of MLC Leaf Positioning at Isocenter	± 1 mm compared to the MLC coordinate value established by software
16	Congruence of Radiation Fields Created by MLC When Rotating the Gantry (Gantry Spoke Shot)	All intersection points lie within a circle with a radius of 1 mm
17	Congruence of MLC-Created Radiation and Light Field Sizes	± 2 mm
18	Congruence of Radiation Fields When Rotating the MLC (MLC Spoke Shot)	All intersection points lie within a circle with a radius of 1 mm
19	Radiation Leakage through Leaf Gaps and Body (Interleaf/Intraleaf Leakage), Leakage through Leaf Tips	≤ 2% (through leaf bodies), ≤ 2.5% (through leaf gaps), and all values of radiation leakage through leaf bodies, gaps, and tips must be incorporated into the radiotherapy planning simulation software

More details can be found in Circular 15/2017/TT-BKHCN of the Ministry of Science and Technology of Vietnam, effective from December 15, 2018.

- Thanh Lam -

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Circular 15/2017/TT-BKHCN

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