A novel dosimetry system for computed tomography using phototransistor

Magalhães, C. M. S. de; Sobrinho, M.L.; Souza, Divanízia do Nascimento; Filho, J. A.; Jr., E.F. da Silva; Santos, Luiz A. P.

doi:10.1016/j.radmeas.2011.10.014

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…Various semiconductor components are widely used as a radiation sensors and have many applications, such as PIN diodes [1], PIN photodiodes [2], phototransistors [3,4], Light-Dependent Resistors (LDR) [5], PMOS [6][7][8] and VDMOS transistors [9,10].…”

Section: Introductionmentioning

confidence: 99%

Floating-Gate MOS Transistor with Dynamic Biasing as a Radiation Sensor

Ilić

Jevtic

Stanković³

et al. 2020

Sensors

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This paper describes the possibility of using an Electrically Programmable Analog Device (EPAD) as a gamma radiation sensor. Zero-biased EPAD has the lowest fading and the highest sensitivity in the 300 Gy dose range. Dynamic bias of the control gate during irradiation was presented for the first time; this method achieved higher sensitivity compared to static-biased EPADs and better linear dependence. Due to the degradation of the transfer characteristics of EPAD during irradiation, a function of the safe operation area has been found that determines the maximum voltage at the control gate for the desired dose, which will not lead to degradation of the transistor. Using an energy band diagram, it was explained why the zero-biased EPAD has higher sensitivity than the static-biased EPAD.

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Section: Introductionmentioning

confidence: 99%

Floating-Gate MOS Transistor with Dynamic Biasing as a Radiation Sensor

Ilić

Jevtic

Stanković³

et al. 2020

Sensors

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“…A very common device used to measure radiation intensity in diagnostic X-ray beams is the photodiode [26] and also the phototransistor [27]. The BJT has also been used as a detector in diagnostic X-ray and radiotherapy beams [28][29][30].…”

Section: Bjt Typical Operation As An X-ray Sensormentioning

confidence: 99%

An Overview on Bipolar Junction Transistor as a Sensor for X-ray Beams Used in Medical Diagnosis

Santos

2022

Sensors

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Although not manufactured to be used under X-ray photons, the commercial bipolar junction transistor (BJT) is an electronic device that can be used as an ionizing radiation sensor. In this article an overview on the BJT and its principle of operation were made for the purpose of better understanding how such a semiconductor device behaves when under diagnostic X-ray beam. Therefore, it addresses some topics such as the structure of the device, the bias configuration when operating in active mode, and so on. Even knowing that the most complete theory to describe the “transistor effect” is based on quantum theory (the energy band theory of solids), here it is preferable to take a simpler experimental approach to clearly understand the operation of the BJT. In electronics, the BJT is used as a current amplifier, and depending on the bias and point of view it also becomes a voltage amplifier. In the analysis of BJT under an X-ray beam, in addition to its operation as a sensor to measure the dose or some diagnostic X-ray tube parameter, it has also led to technological innovation in the technique of digital data storage based on the effect of radiation.

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“…Hitachi joined part of Aloka in 2007, associating itself in the production of technologies, which explains the absence of active patents of the latter [14]. Both Toshiba, Hitachi and Fujifilm, as clusters of companies, operate in various market segments and, with regard to dosimetry, file patents both related to medical imaging equipment and power generation in nuclear reactors, but neither all directly linked to exposure monitoring, but to system components [15][16][17][18][19].…”

Section: Figure 2: Leading Patent Holder Companies In Dosimetrymentioning

confidence: 99%

State-of-the-art techniques in radiation dosimetry – technological segments and applications

Batista

2021

Braz. J. Rad. Sci.

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This work presents a study based on patent filings as a resource for identifying technological trends in the field of radiation dosimetry for a view of the state-of-the- art techniques, in addition to the main actors involved and patent search process in the area of ionizing radiation. It aimed to make an analysis of patent portfolios to outline an application scenario for the knowledge developed in the area. It was carried out through consultation using the Questel Orbit search and analysis system having the word “dosimetry” and its similars, by semantic similarity, for the years between 1999-2019. The results are discussed regarding the main deposits, depositors, time evolution, technological segments and geographic coverage. They point out that companies that operate simultaneously in the area of energy power generation and medical applications have a significant contribution to the production of patents. Studies focused on the development of dosimetric systems move several technological segments, mainly environmental and medical technology.

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A novel dosimetry system for computed tomography using phototransistor

Cited by 6 publications

References 11 publications

Floating-Gate MOS Transistor with Dynamic Biasing as a Radiation Sensor

Floating-Gate MOS Transistor with Dynamic Biasing as a Radiation Sensor

An Overview on Bipolar Junction Transistor as a Sensor for X-ray Beams Used in Medical Diagnosis

State-of-the-art techniques in radiation dosimetry – technological segments and applications

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