Louisiana Administrative Code › Title 33 - ENVIRONMENTAL QUALITY › Part XV - Radiation Protection › Chapter 6 - X-Rays in the Healing Arts › Section XV-610 - Computed Tomography X-Ray Systems

Current through Register Vol. 50, No. 6, June 20, 2024
Contrast Scale
-Repealed.
CS
-Repealed.
CT Conditions of Operation
-Repealed.
CT Gantry
-Repealed.
CTN
-Repealed.
CT Number
-Repealed.
Dose Profile
-Repealed.
Elemental Area
-Repealed.
Multiple Tomogram System
-Repealed.
Noise
-Repealed.
Nominal Tomographic Section
				  Thickness
-Repealed.
Picture Element
-Repealed.
Reference Plane
-Repealed.
Scan
-Repealed.
Scan Increment
-Repealed.
Scan Sequence
-Repealed.
Scan Time
-Repealed.
Single Tomogram System
-Repealed.
Tomographic Plane
-Repealed.
A. Requirements for CT Equipment
1. Technical and Safety Information. The
				technical and safety information relating to the conditions of operation, dose
				information, and imaging performance provided by the CT manufacturer shall be
				maintained by the facility.
2.
				Termination of Exposure.
a. Means shall be
				provided to terminate the X-ray exposure automatically by either de-energizing
				the X-ray source or shuttering the X-ray beam in the event of equipment failure
				affecting data collection. Such termination shall occur within an interval that
				limits the total scan time to no more than 110 percent of its preset value
				through the use of either a backup timer or devices that monitor equipment
				function.
b. A visible signal shall
				indicate when the X-ray exposure has been terminated through the means required
				by LAC 33:XV.610.A.2.a.
c. The
				operator shall be able to terminate the X-ray exposure at any time during a
				scan, or series of scans under CT X-ray system control, of greater than 0.5
				second duration.
3.
				Tomographic Plane Indication and Alignment
a.
				For any single tomogram system, means shall be provided to permit visual
				determination of the tomographic plane or a reference plane offset from the
				tomographic plane.
b. For any
				multiple tomogram system, means shall be provided to permit visual
				determination of the location of a reference plane. This reference plane can be
				offset from the location of the tomographic planes.
c. If a mechanism using a light source is
				used to satisfy LAC 33:XV.610.A.3.a or b, the light source shall allow visual
				determination of the location of the tomographic plane or reference plane under
				ambient light conditions of up to 500 lux.
4. Beam On and Shutter Status Indicators and
				Control Switches.
a. The CT X-ray control and
				gantry shall provide visual indication whenever X-rays are produced.
b. Each emergency button or switch shall be
				clearly labeled as to its function.
5. Indication of CT Conditions of Operation.
				The CT X-ray system shall be designed such that the CT conditions of operation
				to be used during a scan or a scan sequence shall be indicated prior to the
				initiation of a scan or a scan sequence. On equipment having all or some of
				these conditions of operation at fixed values, this requirement may be met by
				permanent markings. Indication of CT conditions of operation shall be visible
				from any position from which scan initiation is possible.
6. Additional Requirements Applicable to CT
				X-ray Systems Containing a Gantry Manufactured After September 3, 1985
a. The total error in the indicated location
				of the tomographic plane or reference plane shall not exceed 5
				millimeters.
b. If the X-ray
				production period is less than 0.5 second, the indication of X-ray production
				shall be actuated for at least 0.5 second. Indicators at or near the gantry
				shall be discernible from any point external to the patient opening where
				insertion of any part of the human body into the primary beam is
				possible.
c. The deviation of
				indicated scan increment versus actual increment shall not exceed +1 millimeter
				with any mass from zero to 100 kilograms resting on the support device. The
				patient support device shall be incremented from a typical starting position to
				the maximum incremented distance or 30 centimeters, whichever is less, and then
				returned to the starting position. Measurement of actual versus indicated scan
				increment may be taken anywhere along this travel.
d. Premature termination of the X-ray
				exposure by the operator shall necessitate resetting of the CT conditions of
				operation prior to the initiation of another scan.