Calibration of a MOSFET Detection System for 6-MV In Vivo Dosimetry

Scalchi, P.; Francescon, P.

doi:10.1016/s0360-3016(97)00894-8

Cited by 95 publications

(78 citation statements)

References 9 publications

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“…A standard deviation of 0.5 mV/Gy is obtained from −90 to 90 • of incidence, corresponding with an uncertainty of 5%. This uncertainty is similar to or even below that of other pMOS dosimeters [5][6][7]27,28]. Moreover, no memory effect is observed when irradiating in a different order with different incidence angles.…”

Section: Angular Dependencesupporting

confidence: 74%

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Evaluation of a low-cost commercial mosfet as radiation dosimeter

Asensio¹,

Carvajal²,

López‐Villanueva³

et al. 2006

Sensors and Actuators A: Physical

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In this work, a low-power commercial MOS transistor was tested as a gamma radiation dosimeter. Due to the small size of its detector, low cost, reproducibility, minimal power requirements, signal conditioning and data processing, it offers excellent possibilities as a dose monitor in radiotherapy. Sensor irradiation in the unbiased mode was aimed at improving patient comfort and facilitating use. Uncertainties in the results were obtained from an exhaustive dosimetric study, following a full statistical study using Monte Carlo analysis techniques. A procedure to compensate for temperature effects was introduced in order to correct the dosimetric parameter extracted. Excellent linearity and good reproducibility were found in the accumulated threshold voltage shift as a function of the accumulated dose, up to 58 Gy (air equivalent). The uncertainty regarding sensor sensitivity was found to be less than 1% for individual device calibration. When collective calibration was carried out, the uncertainty was around 5%, accounting for a set of 31 devices. In this case, a mean value of 29.2 mV/Gy was obtained. In addition, the angular and dose rate dependencies showed good behaviour. These results suggest that the transistor studied would be an excellent candidate for use as the sensing device of a low-cost measurement system capable of in vivo dosimetry.

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Section: Angular Dependencesupporting

confidence: 74%

“…Among them, we would emphasise linearity, small detection volume, fast readout, portability, low power consumption and low radiation attenuation [1][2][3]. In fact, pMOS radiation dosimeters have found a wide range of applications in the fields of spacecraft, medicine, and personal dosimetry [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a low-cost commercial mosfet as radiation dosimeter

Asensio¹,

Carvajal²,

López‐Villanueva³

et al. 2006

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

show abstract

“…They require a bias voltage during irradiation, and their lifetime is limited. [9] They are also highly susceptible to variations in bias voltage, meaning that the bias voltage must be kept constant.…”

Section: Detectors Used In In Vivo Dosimetrymentioning

confidence: 99%

In Vivo Dosimetry In External Radiotherapy

Kesen¹

2017

TJ Oncol

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SUMMARYRadiotherapy is a cancer treatment that uses ionizing radiation to kill or prevent the proliferation of cancerous cells, while also aiming to minimize the damage to healthy tissue. To achieve this in the most effective manner, many radiotherapy machines and treatment techniques have been developed. Today, advanced radiotherapy techniques, such as intensity-modulated radiotherapy, image-guided radiotherapy, and intensity-modulated arc therapy, are frequently being used in cancer treatments. These techniques are applied via computer-controlled devices; therefore, they need to be closely monitored to ensure the dose administered to the patient is as planned. It is important to check the accuracy of the plan to ensure that the correct dose is administered to the patient during treatment. The accuracy of the administered dose can be determined by in vivo dosimetry (IVD). Different measurement devices are used for IVD. In this article, the characteristics of IVD and its measurement systems will be reviewed.

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“…MOSFET'in etkin su eşdeğeri derinliği hangi yüzünün huzmeye baktığına bağlı olarak 0.8 mm veya 1.8 mm'dir. [9] Bu çalışmada dedektörün bombeli yüzü fantom yüzeyine doğru yerleştirildi. Bu pozisyonda 0.8 mm eşdeğer derinlikte standart bias (1mV/cGy) voltajında ölçümler yapıldı.…”

Section: C) Mosfet Dedektörleri Ile Yüzey Dozu öLçümleriunclassified

The effects of thermoplastic masks used for immobilization of patients on surface and build-up for megavoltage radiation

Erkan¹

2013

TJ Oncol

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OBJECTIVESTo examine the effect of thermoplastic masks used for immobilization on surface dose at Co-60 and 6MV photon energies. METHODSThree pieces of Aquaplast masks were used. One of these masks was used intact as a standard. The hole diameters of the other masks were stretched 1.25 and 2-fold. The masks were numbered as 1, 2, 3. Doses were measured with Markus parallel-plate (pp) ionization chamber, EBT2 film and MOS-FET dosimetry. RESULTSThe 1, 2 and 3 numbered masks were increased the surface dose from 24.2% to %73.3, 55.6% and %40.6, respectively, for 10x10 cm 2 at Co-60. For 6MV, the surface dose of 14.4% increased to 50.1%, 34.7% and 23.7%, respectively. Markus pp results were compatible with the EBT2 film results. MOS-FET measured higher surface doses. CONCLUSIONThe surface dose increases in the presence of mask. Mask material thickness and hole diameter significantly affects the surface dose. The diameter of the holes should be enlarged or cut the relevant region.

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Calibration of a MOSFET Detection System for 6-MV In Vivo Dosimetry

Cited by 95 publications

References 9 publications

Evaluation of a low-cost commercial mosfet as radiation dosimeter

Evaluation of a low-cost commercial mosfet as radiation dosimeter

In Vivo Dosimetry In External Radiotherapy

The effects of thermoplastic masks used for immobilization of patients on surface and build-up for megavoltage radiation

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