Wisconsin Administrative Code › Department of Health Services › DHS 110-199 - Health › Chapter DHS 157 - Radiation Protection › Subchapter VIII - X-ray Device Requirements › Section DHS 157.77 - General purpose radiographic systems

Current through June 24, 2024
(1) BEAM
				  LIMITATION.
(a)
Collimation.
The useful beam shall be limited to the area of clinical interest. This
				  requirement is met if a positive beam-limiting device meeting manufacturer's
				  specifications has been properly used or if evidence of collimation is shown on
				  at least 3 sides or 3 corners of the film. Mammography systems are exempt from
				  the collimation requirement.
(b)
General purpose stationary and mobile x-ray systems.
General
				  purpose stationary and mobile x-ray systems, including veterinary systems other
				  than portable, shall meet both of the following requirements:
1. Only x-ray systems provided with means for
				  independent stepless adjustment of at least 2 dimensions of the x-ray field may
				  be used.
2. A method shall be
				  provided for visually defining the perimeter of the x-ray field. The total
				  misalignment of the edges of the visually defined field with the respective
				  edges of the x-ray field along either the length or width of the visually
				  defined field may not exceed 2% of the distance from the source to the center
				  of the visually defined field when the surface upon which it appears is
				  perpendicular to the axis of the x-ray beam.
(c)
Stationary general purpose x-ray
				  systems.
Stationary general purpose x-ray systems, both certified and
				  non-certified, shall meet all the following requirements:
1. A method shall be provided to indicate
				  when the axis of the x-ray beam is perpendicular to the plane of the image
				  receptor, to align the center of the x-ray field with respect to the center of
				  the image receptor to within 2% of the SID and to indicate the SID to within
				  2%.
2. The beam-limiting device
				  shall indicate numerically the field size in the plane of the image receptor to
				  which it is adjusted.
3. Field size
				  dimensions and SIDs shall be specified in inches or centimeters and shall
				  ensure that aperture adjustments result in x-ray field dimensions in the plane
				  of the image receptor that correspond to those indicated by the beam-limiting
				  device to within 2% of the SID when the beam axis is indicated to be
				  perpendicular to the plane of the image receptor.
(d)
X-ray systems designed for one
				  image receptor size.
Radiographic equipment designed for only one
				  image receptor size at a fixed SID shall be provided with means to limit the
				  field at the plane of the image receptor to dimensions no greater than those of
				  the image receptor, and to align the center of the x-ray field with the center
				  of the image receptor to within 2% of the SID, or shall be provided with means
				  to both size and align the x-ray field such that the x-ray field at the plane
				  of the image receptor does not extend beyond any edge of the image
				  receptor.
(e)
Miscellaneous
				  and veterinary x-ray systems.
X-ray systems other than those described
				  in pars. (a) to (c), veterinary systems installed prior to the effective date
				  of August 1, 2002, and all portable veterinary x-ray systems shall meet all of
				  the following requirements:
1. Means shall be
				  provided to limit the x-ray field in the plane of the image receptor so that
				  such field does not exceed each dimension of the image receptor by more than 2%
				  of the SID when the axis of the x-ray beam is perpendicular to the plane of the
				  image receptor.
2. Means shall be
				  provided to align the center of the x-ray field with the center of the image
				  receptor to within 2% of the SID, or means shall be provided to both size and
				  align the x-ray field such that the x-ray field at the plane of the image
				  receptor does not extend beyond any edge of the image receptor. Compliance
				  shall be determined with the axis of the x-ray beam perpendicular to the plane
				  of the image receptor.
3. The
				  requirements in subds. 1. and 2. may be met with a collimator system that meets
				  the requirements for a general purpose x-ray system or, when alignment means
				  are also provided, may be met with either of the following:
a. An assortment of removable,
				  fixed-aperture, beam-limiting devices sufficient to meet the requirement for
				  each combination of image receptor size and SID for which the unit is designed
				  with each such device having clear and permanent markings to indicate the image
				  receptor size and SID for which it is designed.
b. A beam-limiting device with multiple fixed
				  apertures sufficient to meet the requirement for each combination of image
				  receptor size and SID for which the unit is designed. Permanent, clearly
				  legible markings shall indicate the image receptor size and SID that each
				  aperture is designed for and shall indicate which aperture is in position for
				  use.