J Korean Med Sci.  2017 Jul;32(7):1083-1090. 10.3346/jkms.2017.32.7.1083.

Dose-Decreasing Effect of the First Reversed Laser Beam Collimator for C-Arm Type Angiographic Equipment

• Heo YC
• Cho JH
• Han DK

• KMID: 2379601
• DOI: http://doi.org/10.3346/jkms.2017.32.7.1083

Abstract

This is a study on the dose-decreasing effect of the first reversed laser beam collimator (RLBC) for C-arm type angiographic equipment. A laser beam was located at the center of each plane at an oblique angle to the angiographic equipment detector. A field of view, which could be seen with the naked eye, was made by focusing the laser beam in the direction of the X-ray source. The height of the table was fixed at 75 cm and the iron balls were located within 2 mm of the top, bottom, left, and right edges of the output image. The time needed for location fixing, fluoroscopy, and measurement of dose area product (DAP) were compared by having 30 radiologists perform location fixing by looking at the fluoroscopic image while performing location fixing (no radiation) and while the RLBC was turned on. In the next test, the time needed for location fixing, fluoroscopy, and DAP were compared when varying the location of the iron balls from 2 to 10 mm from the edges of the output image. The results showed that the time needed for location fixing, the time needed for fluoroscopy, and DAP decreased, both in the first test and the second test. This study confirmed that the use of a RLBC for C-arm type angiographic equipment decreases both the time needed to perform the procedure and the radiation dose received. It is expected that continuous advancement of RLBC technology will contribute greatly to decreasing the dose of radiation needed and improving convenience during angiography.

Keyword

Dose Area Product; Reversed Laser-Beam Collimator; Fluoroscopic Time; Angiographic Equipment

MeSH Terms

Angiography
Fluoroscopy
Iron
Iron

Figure

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  Fig. 1 A schematic diagram of RLBC. (A) Red line laser diode module. (B) The domed plastic container housing the timer chip and infrared ray receiving device, the timer chip, and 4 laser diode modules are connected. (C) Polystyrene laser diode module fixing device. (D) The acryl panel to be combined with the detector. (E) The arrangement of the parts viewed from the bottom. (F) A mimetic diagram of RLBC operation. An NEC format infrared ray with 38 kHz is operated by a remote control. The infrared rays are received by the RIR, the infrared ray receiving device, and 5 V power source. Then, the 4 diode modules at the Tc run for 10 seconds. RLBC = reversed laser beam collimator, NEC = National Electrical Code, RIR = received infrared ray, Tc = timer chip.

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  Fig. 2 The RLBC mounted on the instrument. (A) The detector with RLBC as seen from the bottom. (B) Seen from the side. (C) The field confirmed by RLBC after locating the iron balls within 2 mm. (D) The field confirmed by RLBC after locating the iron balls within 10 mm. RLBC = reversed laser beam collimator.

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  Fig. 3 RLBC in the test with the iron balls within 2 mm from the edges of image field. (A) The image of the fixed location without using the RLBC in the test with the iron balls within 2 mm from the edges of image field. (B) The image of the fixed location when using the RLBC. (C) and (D) Confirmation that the iron balls are within 2 mm from the edges of the image field. RLBC = reversed laser beam collimator.

• 

  Fig. 4 RLBC in the test with the iron balls within 10 mm from the edges of image field. (A) The image of the fixed location without using the RLBC in the test with the iron balls within 10 mm from the edges of the image field. (B) The image of the fixed location when using the RLBC. (C) Confirmation that the iron balls are within 10 mm of the edges of the image field. RLBC = reversed laser beam collimator.

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