Connecticut Administrative Code
Title 19 - Public Health and Safety
25d - X-Ray Devices used for Diagnosis and Therapy
Section 19-25d-4 - Fluoroscopic installations
Universal Citation: CT Reg of State Agencies 19-25d-4
Current through September 9, 2024
(a) Equipment
(1) The tube housing
shall be of diagnostic type.
(2)
The target-to-panel or target-to-table top distance of equipment installed
before January 1, 1965, shall not be less than twelve inches, and shall not be
less than fifteen inches in equipment installed or reinstalled
thereafter.
(3) The total
filtration permanently in the useful beam shall not be less than two and
one-half millimeters aluminum equivalent. This requirement may be assumed to
have been met if the half-value layer is not less than two and one-half
millimeters aluminum at normal operating voltages.
(4) The equipment shall be so constructed
that the entire cross-section of the useful beam is attenuated by a primary
barrier. This barrier is usually the viewing device, either a conventional
fluoroscopic screen or an image intensification mechanism.
(A)
(i) For
equipment installed before January 1, 1965, the required lead equivalent of the
barrier shall not be less than one and one-half millimeters for one hundred
kvp, shall not be less than one and eight-tenths millimeters for one hundred
twenty-five kvp, or shall not be less than two millimeters for one hundred
fifty kvp.
(ii) For equipment
installed or reinstalled after January 1, 1965, the required lead equivalent of
the barrier shall not be less than two millimeters for one hundred kvp, shall
not be less than two and four-tenths millimeters for one hundred twenty-five
kvp, or shall not be less than two and seven-tenths millimeters for one hundred
fifty kvp.
(iii) Insofar as related
to the provisions of subparagraphs (A) (i) and (A) (ii) of the subdivision for
conventional fluoroscopes these requirements may be assumed to have been met if
the exposure dose rate measured at the viewing surface of the fluorescent
screen does not exceed fifty milliroent gens per hour with the screen in the
primary beam of the fluoroscope without a patient, under normal operating
conditions.
(B)
Collimators shall be provided to restrict the size of the useful beam to less
than the area of the barrier. For conventional fluoroscopes this requirement is
met if, when the adjustable diaphragm is opened to its fullest extent, an
unilluminated margin is left on the fluorescent screen with the screen centered
in the beam at a distance of thirty-five centimeters (fourteen inches) from the
panel or table top. The margin requirement does not apply to installations
where image intensifiers are used, but a protective shield shall be provided in
these installations so that the useful beam does not produce a radiation
hazard.
(C) The tube mounting and
the barrier shall be so linked together that, under conditions of normal use,
the barrier always intercepts the useful beam.
(D) Collimators and adjustable diaphragms or
shutters to restrict the size of the useful beam shall provide a minimum of two
millimeters lead-equivalent protection for one hundred kvp, two and four-tenths
millimeters for one hundred twenty-five kvp or two and seven-tenths millimeters
for one hundred fifty kvp.
(5) The exposure switch shall be of the
dead-man type.
(6) A manual-reset,
cumulative timing device shall be used which will either indicate elapsed time
by an audible signal or turn off the apparatus when the total exposure exceeds
a predetermined limit in one or a series of exposures.
(7) For routine fluoroscopy, the exposure
rate measured at the panel or table top should be as low as practicable and
shall not exceed ten roentgens per minute.
(8) Mobile fluoroscopic equipment shall meet
the requirements of this section where applicable, except that:
(A) In the absence of a table top, a cone or
spacer frame shall limit the target-to-skin distance to not less than twelve
inches.
(B) Image intensification
shall always be provided. Conventional fluoroscopic screens shall not be
used.
(C) It shall be impossible to
operate a machine when the collimating cone or diaphragm is not in
place.
(D) A maximum permissible
dose rate of ten roentgens per minute shall be measured at the minimum
target-to-skin distance.
(b) Structural shielding. Ordinarily, only secondary barriers are necessary except for combined fluoroscopic-radiographic installations.
Disclaimer: These regulations may not be the most recent version. Connecticut may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google
Privacy Policy and
Terms of Service apply.
