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Minnesota Administrative Rules

4732.1130 EQUIPMENT PERFORMANCE TESTS FOR EXTERNAL BEAM TELETHERAPY AND SIMULATION SYSTEMS.

Subpart 1.

Dosimetry.

TEST TYPE MINIMUM TEST INTERVAL TOLERANCE
A. Central axis dose calibration At intervals not to exceed 12 months 2 percent
B. Constancy checks-photons
(1) Dose per monitor unit along central axis Weekly 3 percent
(2) Depth dose Monthly 2 percent
(3) Beam uniformity Monthly 3 percent
(4) Monitor chamber linearity At intervals not to exceed 12 months 1 percent
(5) Timer linearity and error At intervals not to exceed 12 months 1 percent

Subp. 2.

Geometry.

TEST TYPE MINIMUM TEST INTERVAL TOLERANCE
A. Field positioning aids
(1) Light field and radiation field agreement Monthly 2 mm
(2) Mechanical distance pins, lasers, and SSD lights Monthly 2 mm
(3) Scale readouts Monthly 2 mm/1 degree angle
B. Machine alignment
(1) Jaw symmetry At intervals not to exceed 12 months 2 mm
(2) Coincidence of collimator (jaw) and gantry axes At intervals not to exceed 12 months 2 mm
(3) Stability of gantry arm and bearing under rotation At intervals not to exceed 12 months 2 mm
(4) Couch motion and tabletop sag At intervals not to exceed 12 months 2 mm

Subp. 3.

Constancy checks-electrons.

TEST TYPE MINIMUM TEST INTERVAL TOLERANCE
A. Beam uniformity Monthly 5 percent
B. Depth dose Monthly 2 mm at therapeutic depth
C. Dose per monitor unit constancy check Weekly 3 percent

Subp. 4.

Treatment accessories.*

TEST TYPE MINIMUM TEST INTERVAL TOLERANCE
A. Wedge transmission factor At intervals not to exceed 12 months 2 percent
B. Transmission factor constancy for all treatment accessories At intervals not to exceed 12 months 2 percent

*Attenuation in blocks, wedge factors, and compensator data must be checked annually. A visual inspection of the mechanical integrity of these accessories must be done monthly.

Subp. 5.

Simulators.

TEST TYPE FREQUENCY TOLERANCE
A. Localizing lasers Daily 2 mm
B. Distance indicator Daily 2 mm
C. Field size indicator Monthly 2 mm
D. Gantry/collimator angle indicators Monthly 1 degree
E. Cross-hair centering Monthly 2 mm diameter
F. Focal spot-axis indicator Monthly 2 mm
G. Fluoroscopic image quality Monthly Established baseline
H. Collision avoidance Monthly Functional
I. Light/radiation field coincidence Monthly 2 mm or 1 percent
J. Collimator rotation isocenter At intervals not to exceed 12 months 2 mm diameter
K. Gantry rotation isocenter At intervals not to exceed 12 months 2 mm diameter
L. Couch rotation isocenter At intervals not to exceed 12 months 2 mm diameter
M. Coincidence of collimator, gantry, couch axes, and isocenter At intervals not to exceed 12 months 2 mm diameter
N. Table top sag At intervals not to exceed 12 months 2 mm
O. Vertical travel of couch At intervals not to exceed 12 months 2 mm
P. Exposure rate At intervals not to exceed 12 months Established baseline
Q. Table top exposure with fluoroscopy At intervals not to exceed 12 months Established baseline
R. kVp and mAs calibration At intervals not to exceed 12 months Established baseline
S. High and low contrast resolution At intervals not to exceed 12 months Established baseline

Statutory Authority:

MS s 144.12

History:

32 SR 777

Published Electronically:

December 10, 2007

700 State Office Building, 100 Rev. Dr. Martin Luther King Jr. Blvd., St. Paul, MN 55155 ♦ Phone: (651) 296-2868 ♦ TTY: 1-800-627-3529 ♦ Fax: (651) 296-0569