1. (a) All fluoroscopic x-ray systems used shall be image intensified or equipped with direct digital receptors.
2. (b) The fluoroscopic imaging assembly shall be provided with a primary protective barrier which intercepts the entire cross-section of the useful beam at any SID.
3. (c) The x-ray tube used for fluoroscopy shall not produce x-rays unless the barrier is in position to intercept the entire useful beam.
4. (d) X-ray production in the fluoroscopic mode shall be controlled by a device which requires continuous pressure by the fluoroscopist for the entire time of any exposure.
5. (e) When recording serial fluoroscopic images, the fluoroscopist shall be able to terminate the x-ray exposure(s) at any time.
6. (f) A means may be provided to permit completion of any single exposure of the series in progress.
7. (g) Beam limiting devices manufactured after May 22, 1979, and incorporated in equipment with a variable SID or a visible area of greater than 300 square centimeters shall provide stepless adjustment of the x-ray field.

8. (h) All equipment with a fixed SID and a visible area of 300 square centimeters or less shall be provided with:

   1. (1) Stepless adjustment of the x-ray field; or
   2. (2) With means to further limit the x-ray field size at the plane of the image receptor to 125 square centimeters.
9. (i) If provided, stepless adjustment shall, permit continuous field size adjustments down to a minimum field size no greater than 5 centimeters in either length or diameter at maximum SID.
10. (j) For rectangular x-ray fields used with circular image receptors, the error in alignment shall be determined along the length and width dimensions of the x-ray field which pass through the center of the visible area of the image receptor.

11. (k) Fluoroscopic spot-film devices shall meet the following requirements:

    1. (1) Means shall be provided between the source and the patient for adjustment of the x-ray field size in the plane of the image receptor to the size of that portion of the image which has been selected on the spot-film selector;
    2. (2) The adjustment required in He-P 4046.02 (1)(1) shall be automatically accomplished except when the x-ray field size in the plane of the image receptor is smaller than that of the selected portion of the image receptor;
    3. (3) It shall be possible to adjust the x-ray field size in the plane of the image receptor to a size smaller than the selected portion of the image receptor;
    4. (4) The minimum field size at the maximum SID shall be no larger than 5 centimeters in either length or diameter; and
    5. (5) The center of the x-ray field in the plane of the image receptor shall be aligned with the center of the selected portion of the image receptor to not more than 2 percent of the SID.

12. (l) If means exist to override any of the automatic x-ray field size adjustments required in He-P 4046.02(g) through (l), that means:

    1. (1) Shall be designed for use only in the event of system failure;
    2. (2) Shall incorporate a signal visible at the fluoroscopist's position which will indicate whenever the automatic field size adjustment is overridden; and

    3. (3) Shall be clearly and durably labeled:

       “FOR X-RAY FIELD LIMITATION SYSTEM FAILURE”.

Source. #6827, eff 8-6-98; ss by #8692, INTERIM, eff 7-27-06, EXPIRES: 2-2-07; ss by #8808, eff 1-24-07; ss by #10763, INTERIM, eff 1-23-15, EXPIRES: 7-22-15; ss by #10893, eff 7-21-15