New Hampshire Code of Administrative Rules
He - Department of Health and Human Services
Subtitle He-P - Former Division of Public Health Services
Chapter He-P 4000 - NEW HAMPSHIRE RULES FOR THE CONTROL OF RADIATION
Part He-P 4046 - USE OF RADIATION MACHINES: GENERAL REQUIREMENTS FOR ALL DIAGNOSTIC AND VETERINARY X-RAY SYSTEMS
Section He-P 4046.02 - Fluoroscopic X-ray Systems - General Requirements

Universal Citation: NH Admin Rules He-P 4046.02

Current through Register No. 40, October 3, 2024

(a) All fluoroscopic x-ray systems used shall be image intensified or equipped with direct digital receptors.

(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.

(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.

(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.

(e) When recording serial fluoroscopic images, the fluoroscopist shall be able to terminate the x-ray exposure(s) at any time.

(f) A means may be provided to permit completion of any single exposure of the series in progress.

(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.

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

(1) Stepless adjustment of the x-ray field; or

(2) With means to further limit the x-ray field size at the plane of the image receptor to 125 square centimeters.

(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.

(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.

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

(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) 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) 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) The minimum field size at the maximum SID shall be no larger than 5 centimeters in either length or diameter; and

(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.

(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) Shall be designed for use only in the event of system failure;

(2) Shall incorporate a signal visible at the fluoroscopist's position which will indicate whenever the automatic field size adjustment is overridden; and

(3) Shall be clearly and durably labeled:

"FOR X-RAY FIELD LIMITATION SYSTEM FAILURE".

#6827, eff 8-6-98; ss by #8692, INTERIM, eff 7-27-06, EXPIRES: 2-2-07; ss by #8808, eff 1-24-07

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