Validation of a MOSFET dosemeter system for determining the absorbed and effective radiation doses in diagnostic radiology

Manninen, Anna-Leena; Kotiaho, Antti; Nikkinen, Juha; Nieminen, Miika T.

doi:10.1093/rpd/ncu283

Cited by 4 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Yoshizumi et al (2007) reported on the use of the MOSFET dosimeters in computed tomography (CT) for the first time in 2003. Since then, the MOSFET dosimeters have been widely used to estimate organ doses on CT (Hurwitz et al 2006, Mukundan et al 2007, Januzis et al 2015, Nikupaavo et al 2015, cone beam CT (Kim et al 2010, Koivisto et al 2013, Koivisto et al 2018, CT angiography (Hollingsworth et al 2007, Nikolic et al 2010, interventional radiology procedures (Glennie et al 2008, Miksys et al 2010, Lai et al 2014, and digital radiography (Manninen et al 2015). Typically, the MOSFET dosimeters used in diagnostic radiology are the high sensitivity dosimeters as they can measure lower doses than the standard sensitivity dosimeters (Peet and Pryor 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it remains unclear if the scattering radiation has been included in the calibration or in the deduction of the results or not (Hollingsworth et al 2007, Mukundan et al 2007, Yoshizumi et al 2007, Glennie et al 2008, Kim et al 2010, Miksys et al 2010, Nikolic et al 2010, Lai et al 2014, Januzis et al 2015, Nikupaavo et al 2015. Typically, the calibrations have been conducted in air without any scattering material (Hurwitz et al 2006) or with polymethyl methacrylate (PMMA) backscatter material (Brady and Kaufman 2012, Koivisto et al 2013, Manninen et al 2015. Furthermore, the calibrations have usually been conducted with the same device which is used in organ dose measurements (Mukundan et al 2007, Koivisto et al 2013, Lai et al 2014, Januzis et al 2015, Nikupaavo et al 2015.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of MOSFET dosimeters’ calibration method on calibration factors and radiation doses measured with the dosimeters in radiology

Happonen¹,

Husso²,

Matikka³

2022

Biomed. Phys. Eng. Express

View full text Add to dashboard Cite

MOSFET dosimeters have widely been used to measure radiation doses caused by x-rays. When using the MOSFET dosimeters, calibration factors (CFs) have a direct effect on reliability of dose measurements. The aim of this paper was to study the effect of various calibration methods on the CFs of the MOSFET dosimeters. The CFs were measured on clinical digital x-ray angiography (XA) and computed tomography (CT) devices using a calibrated CT ionization chamber and a standard polymethyl methacrylate (PMMA) phantom. The measurements were conducted by having the dosimeters 1) in air, 2) on the surface of the PMMA phantom and 3) inside the phantom. A statistically significant difference was seen between the CFs measured on the XA and CT devices. The CFs measured on the CT device were 20-165% higher than those measured with the XA device (p < 0.001) in every calibration geometry. Furthermore, the calibration geometry had a notable effect on the CFs on CT. The CFs on the surface of the phantom were 18-25% higher than in air (p < 0.05), and the CFs inside the phantom were 32-39% smaller than in air (p < 0.05). These results suggest that the calibration of the MOSFET dosimeters should be conducted with the same device that is used in actual dose measurements. Also, the scattering conditions and the calibration geometry should be similar in the calibration and subsequent dose measurements.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of MOSFET dosimeters’ calibration method on calibration factors and radiation doses measured with the dosimeters in radiology

Happonen¹,

Husso²,

Matikka³

2022

Biomed. Phys. Eng. Express

View full text Add to dashboard Cite

show abstract

“…Dans cette étude, nous avons souhaité tester une autre méthode de mesure de la dose reçue au cuir chevelu basée sur la technologie MOSFET (Metal Oxide Semiconductor Field Effect Transistor), afin de vérifier si nous pouvions avoir une mesure de la dose cutanée en temps réel et si nous pouvions envisager de remplacer notre système de mesure basé sur les films radiochromiques. Différentes études ont montré la possibilité d'utilisation des dosimètres MOSFET pour la détermination de la dose à la peau en radiologie (Bower et Hintenlang, 1998 ;Peet et Pryor, 1999 ;Cheung et al, 2003 ;Ehringfeld et al, 2005 ;Falco et al, 2012 ;Bassinet et al, 2013 ;Manninen et al, 2015). Cependant, aucune de ces études n'a comparé les résultats obtenus en termes de dose cutanée maximale entre les films radiochromiques et les dosimètres MOSFET.…”

Section: Introductionunclassified

Dose au cuir chevelu en neuroradiologie interventionnelle : évaluation de la technologie de dosimétrie MOSFET

et al. 2018

View full text Add to dashboard Cite

Objectifs : Évaluer la technologie MOSFET en comparaison avec la technologie des films radiochromiques pour déterminer la dose cutanée maximale reçue par le patient au niveau du cuir chevelu lors d’embolisations vasculaires intra crâniennes. Sensibiliser les opérateurs à l’importance de la dose reçue par les patients avec la visualisation en temps réel de cette valeur que permet la technologie MOSFET. Matériel et méthode : Six patients traités pour un anévrysme intracrânien ont fait l’objet de 24 mesures comparatives de dose par film radiochromique et avec la technologie MOSFET. Résultats : Les dosimètres MOSFET mesuraient la dose ponctuelle au cuir chevelu du patient en temps réel et avec un niveau de précision suffisant, compte tenu du besoin (dose inférieure de 9 % à celle lue par les films dans 54 % des cas et supérieure de 12 % dans 45 % des cas). Néanmoins, il s’agissait de valeurs localisées au point de mesure de chaque dosimètre MOSFET, alors que les films radiochromiques permettaient d’accéder à une cartographie dosimétrique prenant en compte les recoupes et chevauchements des champs d’exposition. Conclusion : La dosimétrie MOSFET, actuellement plus onéreuse, nous apparaissait donc plus indiquée pour des mesures de dose ciblées (e.g. cristallin) ou sur des champs de dose uniforme que pour une recherche systématique de la dose cutanée maximale lors d’embolisations vasculaires intracrâniennes, pour laquelle nous persisterons à utiliser les films radiochromiques.

show abstract

A comparison of entrance skin dose delivered by clinical angiographic c-arms using the real-time dosimeter: the MOSkin

Thorpe

Cutajar

Lian

et al. 2016

Australas Phys Eng Sci Med

View full text Add to dashboard Cite

Coronary angiography is a procedure used in the diagnosis and intervention of coronary heart disease. The procedure is often considered one of the highest dose diagnostic procedures in clinical use. Despite this, there is minimal use of dosimeters within angiographic catheterisation laboratories due to challenges resulting from their implementation. The aim of this study was to compare entrance dose delivery across locally commissioned c-arms to assess the need for real-time dosimetry solutions during angiographic procedures. The secondary aim of this study was to establish a calibration method for the MOSkin dosimeter that accurately produces entrance dose values from the clinically sampled beam qualities and energies. The MOSkin is a real-time dosimeter used to measure the skin dose delivered by external radiation beams. The suitability of the MOSkin for measurements in the angiographic catheterisation laboratory was assessed. Measurements were performed using a 30 × 30 × 30 cm(3) PMMA phantom positioned at the rotational isocenter of the c-arm gantry. The MOSkin calibration factor was established through comparison of the MOSkin response to EBT2 film response. Irradiation of the dosimeters was performed using several clinical beam qualities ranging in energy from 70 to 105 kVp. A total of four different interventional c-arm machines were surveyed and compared using the MOSkin dosimeter. The phantom was irradiated from a normal angle of incidence using clinically relevant protocols, field sizes and source to image detector distance values. The MOSkin was observed to be radiotranslucent to the c-arm beam in all clinical environments. The MOSkin response was reproducible to within 2 % of the average value across repeated measurements for each beam setting. There were large variations in entrance dose delivery to the phantom between the different c-arm machines with the highest observed cine-acquisition entrance dose rate measuring 326 % higher than the lowest measured cine-acquisition entrance dose rate and with the highest measured fluoroscopic entrance dose rate measuring 346 % higher than the lowest measured fluoroscopic entrance dose rate. This comparison of entrance dose delivery across local clinical c-arms demonstrated the disparity in entrance dose delivery across catheterisation laboratories and outlined a need for real-time dose monitoring systems for patients during angiographic procedures. Through use of our calibration method, an average MOSkin calibration of 7.37 mV/cGy was established. The calibration method allowed entrance dose to be measured across a range of beam energies and beam qualities without the input of the c-arm beam characteristics. This calibration factor was proven to reproduce entrance dose values to within 5 % value of the reference dosimeter's response, suggesting potential for further studies and utilisation of the dosimeter in this field.

show abstract

Validation of a MOSFET dosemeter system for determining the absorbed and effective radiation doses in diagnostic radiology

Cited by 4 publications

References 17 publications

Effect of MOSFET dosimeters’ calibration method on calibration factors and radiation doses measured with the dosimeters in radiology

Effect of MOSFET dosimeters’ calibration method on calibration factors and radiation doses measured with the dosimeters in radiology

Dose au cuir chevelu en neuroradiologie interventionnelle : évaluation de la technologie de dosimétrie MOSFET

A comparison of entrance skin dose delivered by clinical angiographic c-arms using the real-time dosimeter: the MOSkin

Contact Info

Product

Resources

About