Indiana Administrative Code › Title 410 - INDIANA DEPARTMENT OF HEALTH › Article 5 - RADIOLOGICAL HEALTH › Rule 6.1 - X-Rays in the Healing Arts › Section 6.1-119 - Diagnostic x-ray systems

Current through July 10, 2024
Authority: IC
				  16-41-35-26;
				  IC
				  16-41-35-29
Affected: IC 16-41-35
Sec. 119.
(a)
				Podiatric and veterinary x-ray facilities shall be evaluated at least once each
				twenty-four (24) months by a diagnostic imaging physicist or x-ray machine
				inspector approved by the department. Dental x-ray facilities shall be
				evaluated at least once each thirty-six (36) months by a diagnostic imaging
				physicist or x-ray machine inspector approved by the department.
Mammography facilities shall be evaluated at least once each
				  twelve (12) months by a diagnostic imaging physicist approved by the
				  department. All other diagnostic x-ray systems shall be evaluated at least once
				  each twelve (12) months by a diagnostic imaging physicist or x-ray machine
				  inspector approved by the department. Those x-ray facilities which have been
				  evaluated within sixty (60) days after the end of the interval established in
				  this section will be considered to be in compliance with this section as long
				  as the evaluation occurs in the same calendar year as the date on which
				  reevaluation is required. All diagnostic x-ray systems shall comply with this
				  section.
(b) The x-ray
				control panel containing the main power switch shall bear the warning
				statement, legible and accessible to view, "WARNING: This x-ray system may be
				dangerous to patient and operator unless safe exposure factors and operating
				instructions are observed.".
(c)
				For battery-powered generators, visual means shall be provided on the x-ray
				control panel to indicate whether the battery is charged adequately for proper
				operation.
(d) Leakage radiation
				from the diagnostic source assembly measured at a distance of one (1) meter in
				any direction from the source shall not exceed one hundred (100) mR in one (1)
				hour when the x-ray tube is operated at its leakage technique factors.
				Compliance shall be determined by measurements averaged over an area of one
				hundred (100) square cm with no linear dimension greater than twenty (20)
				cm.
(e) Radiation emitted by a
				component other than the diagnostic source assembly shall not exceed two (2) mR
				in one (1) hour at five (5) cm from any accessible surface of the component
				when it is operated in an assembled x-ray system under any condition for which
				it was designed. Compliance shall be determined by measurements averaged over
				an area of one hundred (100) square cm with no linear dimension greater than
				twenty (20) cm.
(f) The half-value
				layer of the useful beam for a given x-ray tube voltage shall be no less than
				the values shown as follows:
TABLE I
Design Operating Range
Measured Voltage
Half-Value Layer Aluminum
							 Equivalent
Below 50 kVp
30 kVp
0.3 mm
40 kVp
0.4 mm
49 kVp
0.5 mm
50 to 70 kVp
50 kVp
1.2 mm
60 kVp
1.3 mm
70 kVp
1.5 mm
71 kVp
2.1 mm
80 kVp
2.3 mm
90 kVp
2.5 mm
100 kVp
2.7 mm
110 kVp
3.0 mm
120 kVp
3.2 mm
130 kVp
3.5 mm
140 kVp
3.8 mm
150 kVp
4.1 mm
For a kVp not listed in Table I, linear interpolation shall
				  be utilized to determine the minimum acceptable half-value layer. For capacitor
				  energy storage x-ray systems, compliance shall be determined with the maximum
				  charge per exposure assumed to be the kVp. The required minimum aluminum
				  equivalent filtration shall include the filtration contributed by all materials
				  which are always present between the source and the patient. The requirements
				  of this subsection will be considered to have been met if it can be
				  demonstrated that the aluminum equivalent of the total filtration in the
				  primary beam is not less than that shown as follows:
TABLE II
Total Filtration
Operating Voltage
Aluminum Equivalent
Below 50 kVp
0.5 mm
50 to 70 kVp
1.5 mm
Above 70 kVp
2.5 mm
In addition, there must be compliance with the
				  following:
(1) Beryllium window tubes
				shall have a minimum of five-tenths (0.5) mm aluminum equivalent filtration
				permanently installed in the useful beam.
(2) For capacitor energy storage equipment,
				compliance with this subsection shall be determined with the maximum quantity
				of charge per exposure.
(3) For
				x-ray systems which have variable kVp and variable filtration for the useful
				beam, a device shall link the kVp selector with the filters and shall prevent
				an exposure unless the minimum filtration required by this subsection is in the
				useful beam for the kVp which has been selected.