Radiation Dose Assessment of the Fog Lead Acrylic Shields during Coronary Angiography: A Phantom Study

This study aimed to evaluate the effects of fogging on the effectiveness of a lead glass shield in protecting an operator from radiation exposure during conventional coronary angiography (CAG). Optically stimulated luminescence dosimeters (OSLDs) were used to measure the effects of fogged lead glass shields (FLSs) and clear lead glass shields (CLSs) on the radiation doses of a cardiac catheterization surgeon. We simulated the scatter radiation incident on the operator with five angiographic projections with 10-s exposures. Experiments were conducted with a field of view of 25 cm, maximum of 100 cm between the X-ray tube and image intensifier, and 80 cm between the image intensifier and operator. Lead glass fogging had no significant effect at any angiographic projection. The average dose at the lens of the eye, thyroid glands, and gonads did not differ significantly between FLS and CLS. Although most surgeons view ceiling-suspended shields as hindrances during surgical procedures, the radiation dose at the operator’s eyes and thyroid glands increased by 13 and 10 times without the shield. The fogging of the shield is probably caused by post-surgery UV decontamination or detergents. An operator has no cause for concern regarding the radiation protection afforded by an FLS during CAG procedures.

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Comparison of Contrast Volume, Radiation Dose, Fluoroscopy Time, and Procedure Time in Previously Published Studies of Rotational Versus Conventional Coronary Angiography

The American Journal of Cardiology ◽

10.1016/j.amjcard.2015.03.042 ◽

2015 ◽

Vol 116 (1) ◽

pp. 43-49 ◽

Cited By ~ 8

Author(s):

Rohit S. Loomba ◽

Rodrigo Rios ◽

Matthew Buelow ◽

Mamata Eagam ◽

Saurabh Aggarwal ◽

...

Keyword(s):

Radiation Dose ◽

Coronary Angiography ◽

Fluoroscopy Time ◽

Conventional Coronary Angiography ◽

Procedure Time ◽

Contrast Volume

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Some novel features of post-500°C heating blue stimulated OSL emission of fired natural quartz

Geochronometria ◽

10.1515/geochr-2015-0078 ◽

2017 ◽

Vol 44 (1) ◽

pp. 287-298

Author(s):

Dileep K Koul ◽

Anuj Soni ◽

Debabrata Datta

Keyword(s):

Radiation Dose ◽

Dose Range ◽

Optically Stimulated Luminescence ◽

Dose Assessment ◽

High Radiation ◽

Dose Limit ◽

Natural Quartz ◽

Reliable Assessment ◽

Order Of Magnitude ◽

High Dynamic

Abstract In this study, some novel features of the post 500°C blue stimulated optically stimulated luminescence (OSL) of fired geological quartz are reported. Different observations (i) pulse annealing and (ii) impact of bleaching on high temperature TL glow peak suggested 510°C (heating rate of 2°C/s) TL peak trap to be responsible for the observed emission. The dosimetric properties of this emission were seen to make its applicability for dose assessment till kGy range. The signal was seen to be easily bleachable, reaching background value within 100 s with blue light at 125°C. The signal qualified all the tests (i) reproducibility, (ii) negligible recuperation and (iii) accuracy of dose recovery needed for reliable assessment of the radiation dose with modified Single aliquot regenerative (SAR) protocol. Considering the bleachability and high dynamic dose range of this signal, it has the potential to stretch the upper dose limit of dating by one order of magnitude than possible with conventional OSL, corresponding to 325°C TL trap. So, combining all the results, the signal reported here could be very useful for dosimetric applications involving measurement of high radiation dose, like dating.

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Abstract 5802: Whole-Heart Coronary Angiography using Volume Computed Tomography in Comparison to Conventional Coronary Angiography

Circulation ◽

10.1161/circ.118.suppl_18.s_106 ◽

2008 ◽

Vol 118 (suppl_18) ◽

Author(s):

Marc Dewey ◽

Elke Zimmermann ◽

Florian Deissenrieder ◽

Michael Laule ◽

Hans-Peter Dübel ◽

...

Keyword(s):

Computed Tomography ◽

Radiation Dose ◽

Coronary Angiography ◽

Coronary Ct Angiography ◽

Conventional Coronary Angiography ◽

Effective Radiation Dose ◽

Initial Report ◽

Coronary Ct ◽

Whole Heart ◽

Effective Radiation

This is an initial report on the use of the recently introduced whole-heart 320-slice computed tomography (CT) scanner for noninvasive coronary angiography compared with conventional coronary angiography (CCA). Whole-heart CT avoids overscanning and overranging as necessary for helical coronary CT acquisitions thereby significantly reducing the effective radiation dose. Twelve patients with suspected coronary artery disease (4 women, 8 men; mean age 64.6 ± 11 years) have undergone coronary CT angiography using a 320-slice scanner (Aquilion ONE, Toshiba; 0.35 s gantry rotation time, 120 kV, and 350 – 450 mA) prior to clinically indicated CCA. CT images were manually reconstructed in motion-free phases with 0.5-mm slice thickness and 0.25-mm slice increment. Independent blinded assessment of CT and CCA (using quantitative analysis) was performed to detect significant (at least 50%) diameter stenoses. Of the 12 patients, in 8 patients, single-heart beat CT acquisition was performed, resulting in an effective dose of 5.6 ± 1.1 mSv and an image reconstruction window length of 175 msec. In the other 4 patients, because of higher heart rates, 2 or 3 heart beats were used for acquisition, resulting in higher radiation exposure (on average 17 mSv) and the possibility to perform multisegment reconstruction with improved temporal resolution (88 and 58 msec image reconstruction windows, respectively). Per-patient sensitivity and specificity for CT compared to CCA were 100%. Per-vessel sensitivity and specificity were 88% and 95%, respectively. Intraindividual comparison of CT with CCA revealed a nonsignificantly smaller effective radiation dose (9.4 ± 7.2 mSv vs. 10.5 ± 5.3 mSv, p<0.69) but significantly smaller contrast agent amount (80 ±0 ml vs. 107.3 ± 17.8 ml, p<0.01) for 320-slice CT. Whole-heart CT significantly reduces the contrast agent amount compared to CCA while radiation exposure is reduced in patients with slow heart rates. This initial report also indicates that diagnostic accuracy of coronary CT angiography using up to 320 simultaneous detector rows remains high as compared with CCA as the reference standard.

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