Texas Register, Volume 29, Number 5, Pages 727-1096, January 30, 2004 Page: 818
727-1096 p. ; 28 cm.View a full description of this periodical.
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(iv) Either the product of peak x-ray tube potential,
current, and exposure time shall be limited to not more than 60 kWs per
exposure, or the product of x-ray tube current and exposure time shall
be limited to not more than 600 mAs per exposure except that, when
the x-ray tube potential is less than 50 kVp, the product of x-ray tube
current and exposure time shall be limited to not more than 2,000 mAs
per exposure.
(v) A visible and/or audible signal shall indicate
when an exposure has been terminated at the limits required by clause
(iv) of this subparagraph, and manual resetting shall be required before
further automatically timed exposures can be made.
(C) [(D)] Exposure interval reproducibility. When all
technique factors are held constant, including control panel selections
associated with AEC systems, the coefficient of variation of exposure
interval for both manual and AEC systems shall not exceed 0.05. This
requirement applies to clinically used techniques.
(3) SSD. All mobile or portable radiographic systems shall
be provided with means to limit the SSD to equal to or greater than 30
cm.
(4) Exposure reproducibility. When all technique factors
are held constant, including control panel selections associated with
AEC systems, the coefficient of variation of exposure for both manual
and AEC systems shall not exceed 0.05. This requirement applies to
clinically used techniques.
(5) Linearity. The average ratios of exposure mR to the indi-
cated mAs product obtained at any two consecutive mA or mAs settings
shall not differ by more than 0.10 times their sum, where X and X2 are the
average mR/mAs values obtained at each of two consecutive tube current
settings:
Figure: 25 TAC 289.227(l)(5)
[F2gure: 2 TAG 289.227(m()]
(6) Radiation from capacitor energy storage equipment in
standby status. Radiation emitted from the x-ray tube when the ex-
posure switch or timer is not activated shall not exceed a rate of 2 mil-
liroentgens per hour (mR/hr) at 5 cm from any accessible surface of the
diagnostic source assembly, with the beam-limiting device fully open.
[(n) Additional requirements pecifica1y for veterinary x-ray
systems.]
[(1) The x-ray control shall provide visual or audible indi-
cation of the production of x-rays observable at or from the operator- s
prteeted position whenever x-rays are produced]
[(2) Beam limiting devices shall do the following-]
[(A) povide the same degree of protection as is
required of the housing;]
[(B) restrict the useful beam to the area of clinical in-
terest and]
[(C) limit the -ray field such that the x-ray field shall
not exceed:]
[(i 2.0% of the SID for the length or width of the
rectangular image receptor; or]
[(ii) 2-0% of the SID for the diagonal of the image
receptor for eireelar image receptors]
[43) A means shall be provided to center the primary beam
to the image receptor within 2.0% of the STDJ]
[(4) A means shall be provided to terminate the exposure
at the following:][(A) a preset time interval;]
[(3) a preset product of eurrent and time;]
[(C) a preset number of pulses; or]
[(D) a preset radiation exposure to the image receptor]
[{5) The radiation machine shall not be able to make an
exposure when the timer is set to a "zero" or "off" position if either
position is provided.]
[(6) All stationary, mobile, or portable x-ray systems used
for veterinary x rays shall be provided with the following:]
[(A) a continuous pressure type exposure switehand]
[(B) either a six and one-half feeoot high preteetive barrier
for operator protection during expoures; or]
[(C) a means for the operator to be at least six feet from
the tube housing assembly]
[(7) Operators using portable radiation machines designed
to be hand-held are exempt from the requirements of paragraph (6)
of this subsection. The hand-held portable radiation machine shall be
held by the tube housing support or handle. The operator shall wear
protective devices in accordance with subsection (i)(4) of this section.]
[(8) When all tehnique ors are held constant including
control panel selections associated with ABG systems ,.the efficient
of variation of exposure for both manual and E systems shall not
exceed O05 This requirement applies to clinically used techniques.]
[(9) The technique factors to be used during an exposure
shall be indicated before the exposure begins, If A Cs are used, the
technique factors that are set prior to the exposure shall be indicated.]
[(40) For machines having 4*ed technique fotrs the re-
quirements of paragraph (9) of this subsection may be met by perma-
nent markings on the equipment. Indication of technique factors shall
be visible from the operator-s position except in the ease of spot films
made by the fluorosecpist.]
[(-1-) Fluorocopic and CT units used in veterinary facili-
ties shall meet the requirements 4b sbsections +e) and (p)of this see-
tiom Therapy systems used in veterinary facilities shall meet the re-
quirements of 289-229 of this title.]
[(4-2) Portable machines shall be used in a manner that
complies with this section]
[(43) All exams and retakes shall be ordered by the veteri-
narian]
(m) [(o)] Fluoroscopic x-ray systems and spot-film devices
for all facilities.
(1) Limitation of the useful beam. Limitation of the useful
beam shall be as follows.
(A) Primary barrier.
(i) The fluoroscopic imaging assembly shall be pro-
vided with a primary protective barrier that intercepts the entire cross
section of the useful beam at any SID.
(ii) The x-ray tube used for fluoroscopy shall not
produce x rays unless the barrier is in position to intercept the useful
beam and the imaging device is in place and operable.
(iii) The exposure rate due to transmission through
the barrier with the attenuation block in the useful beam, combined with
radiation through the image intensifier if provided, shall not exceed
3.34 x 10-3% of the entrance exposure rate at a distance of 10 cm from29 TexReg 818 January 30, 2004 Texas Register
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Texas. Secretary of State. Texas Register, Volume 29, Number 5, Pages 727-1096, January 30, 2004, periodical, January 30, 2004; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth101101/m1/90/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.