Estimation of Patient Dose by Using a Digital Imaging System

Shiraishi, Junji; Tatsumi, Daisaku; Tsushima, Hiroyuki; Utsunomiya, Akane; Kusumi, Kenichi; Doi, Kunio

doi:10.6009/jjrt.kj00001357640

Cited by 4 publications

(2 citation statements)

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“…Several methods for estimating the exposure dose with indices relating to the PSL value have been reported. [11][12][13][14][15] Tatsumi et al 11 reported on the dependency of the S number for exposure doses ranging from 0.13 to 1.3 C kg −1 ͑0.5 to 5 mR͒ and the tube voltage from 40 to 120 kV. Chu et al 12 showed how the S number decreased when the tube voltage was increased in a range between 50 and 90 kVp.…”

Section: Introductionmentioning

confidence: 99%

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Development of dosimetry using detectors of diagnostic digital radiography systems

et al. 2006

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Dosimetry using an imaging plate (IP) of computed radiography (CR) systems was developed for quality control of output of the x-ray equipment. Sensitivity index, or the S number, of the CR systems was used for estimating exposure dose under the routine condition: exposure dose from 1.0 to 1.0 x 10(2) microC kg(-1), tube voltages from 50 to 120 kV, and added filtration from 0 to 4.0 mm Al. The IP was calibrated by using a 6 cc ionization chamber having traceability to the National Standard Ionization Chamber. The uncertainty concerning the fading effect was suppressed less than 1.9% by reading the latent image 4 min+/-5 s after irradiation at the room temperature 25.9+/-1.0 degrees C. The S number decreased linearly on the logarithmic graph regardless of the beam quality as exposure dose increased. The relationship between the exposure dose (E) and the S number was fitted by the equation E=a' X S(-b). The coefficient a' decreased when the added filtration and the tube voltage were increased. The coefficient b was 0.977+/-0.007 in all beam qualities. The dosimetry using the IP and the equation can estimate the exposure dose in a range from 9.0 x 10(-2) to 5.0 microC kg(-1) within an uncertainty of +/-5% required by the Japanese Industry Standard. This dose range partially included the doses under routine condition. The doses between 1.0 and 1.0 x 10(2) microC kg(-1) under the routine condition can be shifted to the 5% region by using an absorber. The IP dosimetry is applicable to the quality control of the CR systems.

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Section: Introductionmentioning

confidence: 99%

“…Shiraishi et al 13 estimated the entrance surface doses of 182 patients by using the PSL value per pixel. The doses ranging from 0.8 to 25 C kg −1 ͑from 0.03 to 0.9 mGy͒ were determined within an uncertainty of ±40%.…”

Section: Introductionmentioning

confidence: 99%

Development of dosimetry using detectors of diagnostic digital radiography systems

et al. 2006

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Management of pediatric radiation dose using Agfa computed radiography

Schaetzing¹

2004

Pediatr Radiol

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Radiation dose to patients and its management have become important considerations in modern radiographic imaging procedures, but they acquire particular significance in the imaging of children. Because of their longer life expectancy, children exposed to radiation are thought to have a significantly increased risk of radiation-related late sequelae compared to adults first exposed to radiation later in life. Therefore, current clinical thinking dictates that dose in pediatric radiography be minimized, while simultaneously ensuring sufficient diagnostic information in the image, and reducing the need for repeat exposures. Dose management obviously starts with characterization and control of the exposure technique. However, it extends farther through the imaging chain to the acquisition system, and even to the image processing techniques used to optimize acquired images for display. Further, other factors, such as quality control procedures and the ability to handle special pediatric procedures, like scoliosis exams, also come into play. The need for dose management in modern radiography systems has spawned a variety of different solutions, some of which are similar across different manufacturers, and some of which are unique. This paper covers the techniques used in Agfa Computed Radiography (CR) systems to manage dose in a pediatric environment.

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Response of the imaging plates to the electron beams from a linear accelerator at ultra-low intensity

Shimomura¹,

Taniguchi²,

Okuda

et al. 2014

Progress in Nuclear Science and Technology

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The response of the imaging plate (IP) as a two-dimensional irradiation dose monitor of high-energy electrons has been investigated. The Co-60 γ-ray irradiation facilities and the 16 MeV S-band electron linear accelerator (linac) in Radiation Research Center, Osaka Prefecture University have been used for the experiments. From the results of the irradiation experiments with γ-rays uniform response of IP over the plate and linear response to the exposure have been obtained. Thermoluminescence dosimeter has been used to determine the exposure. The ultra-low intensity electron beams developed have been used. The results of the irradiation experiments with the narrow electron beams from the linac at an energy of 8 MeV have shown the linear response of IP to the total electron charge for irradiation. By the broad beam an IP image of a model sample has been obtained showing the characteristic scattering behavior of high-energy electrons. These results have shown the applicability of IP to monitoring two-dimensional dose distribution of electrons.

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Estimation of Patient Dose by Using a Digital Imaging System

Cited by 4 publications

References 1 publication

Development of dosimetry using detectors of diagnostic digital radiography systems

Development of dosimetry using detectors of diagnostic digital radiography systems

Management of pediatric radiation dose using Agfa computed radiography

Response of the imaging plates to the electron beams from a linear accelerator at ultra-low intensity

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