Radiation Biology for Medical Physicists

Sureka, C.S.; Armpilia, Christina

doi:10.1201/9781315153780

Cited by 18 publications

(17 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The following coordinate system is defined relative to the water phantom for clarification of beam data and test case geometry and created by using our treatment planning system ROCS:  The origin is at the isocenter of the treatment unit as shown in Figure (1). The phan tom surface is positioned at the isocenter for all the tests except the isocentric test.…”

Section: Tps Water Phantom Coordinates Systemmentioning

confidence: 99%

“…In clinical practice, the curves of dose-response are defined to be very steep. If the dose changed by 5% causes a change of 10-30% in the tissue response concerning the steepest portion of such curves [1]. The needed precision in radiation therapy is based on the steepness of these dose-response relationships and on what accuracy is feasible as one accounts for the various steps involved in the radiation treatment process [2].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Insights to Achieve More Accuracy for the Conventional Treatment Planning Systems

2021

Journal of Measurement Science and Applications (JMSA)

View full text Add to dashboard Cite

Many documents and protocols had been published in the field of treatment planning systems (TPS) quality assurance, verifying dose calculation to the relevant measurements. International Atomic Energy Agency (IAEA) had published Technical Documents (TEC-DOCs) concerned with the TPS quality assurance intended to the developing countries to suits the conventional facilities in their centers. This work aimed to evaluate the dosimetric performance of the TPS that available in our department, following the guidelines of IAEA. Twelve test cases were chosen to verify the TPS dosimetric performance in homogenous water that can be applied by our available dosimetric tools. Two of these test cases related to the absolute dose measurements on the central axis of the open square field sizes (relative output factor (S c,p )) and wedge output factor (WOF) for wedged square field sizes. The other test cases involved relative measurements as percentage depth dose (PDD) curves, beam profiles, off-axis ratio (OAR) dose values, penumbra region, and radiological width (RW) 50 . The results analyzed by the confidence limit concept and the tolerance criteria of acceptability stated by IAEA TEC-DOCs. Results show that TPS calculations are in good agreement with the measurements and within limits except for the parameters (RW) 50 and (WOF) of the tested field sizes that exceeding the tolerance limits. The deviation () in the TPS calculations of (RW) 50 = 2.5 mm, the penumbra regions are 2.6 mm and 2.8 mm for photon beam energies 6 and 10 MV, respectively. The proposed analysis display, determining clearly the orientations of calculation errors. This method elaborates errors and their directions in a good way.

show abstract

Section: Tps Water Phantom Coordinates Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insights to Achieve More Accuracy for the Conventional Treatment Planning Systems

2021

Journal of Measurement Science and Applications (JMSA)

View full text Add to dashboard Cite

show abstract

“…The higher-energy UV-C rays can damage DNA and RNA via cross-linking of thymidine and uracil nucleotides, respectively, thus preventing the replication of microbes such as bacteria and viruses [9]. At these wavelengths, the amount of surface pathogen inactivation is directly proportional to the dose of UV radiation, with dosage being defined as the product of intensity (W/m 2 ) and exposure duration(s) [10,11]. Therefore, UVGI is a relatively simple method of decontamination that causes minimal damage to the respirator and avoids the use of irritating chemicals.…”

Section: Introductionmentioning

confidence: 99%

UV decontamination of personal protective equipment with idle laboratory biosafety cabinets during the COVID-19 pandemic

et al. 2021

View full text Add to dashboard Cite

Personal protective equipment (PPE) is crucially important to the safety of both patients and medical personnel, particularly in the event of an infectious pandemic. As the incidence of Coronavirus Disease 2019 (COVID-19) increases exponentially in the United States and many parts of the world, healthcare provider demand for these necessities is currently outpacing supply. In the midst of the current pandemic, there has been a concerted effort to identify viable ways to conserve PPE, including decontamination after use. In this study, we outline a procedure by which PPE may be decontaminated using ultraviolet (UV) radiation in biosafety cabinets (BSCs), a common element of many academic, public health, and hospital laboratories. According to the literature, effective decontamination of N95 respirator masks or surgical masks requires UV-C doses of greater than 1 Jcm−2, which was achieved after 4.3 hours per side when placing the N95 at the bottom of the BSCs tested in this study. We then demonstrated complete inactivation of the human coronavirus NL63 on N95 mask material after 15 minutes of UV-C exposure at 61 cm (232 μWcm−2). Our results provide support to healthcare organizations looking for methods to extend their reserves of PPE.

show abstract

“…Böylece kütlesel enerji soğurma katsayısı (µ en /ρ), tıp ve sağlık fiziğinde önemli bir araç olarak kabul edilir ve soğurulan dozu tahmin etmek için değerli bilgiler sağlar [4]. Birçok element, bileşik veya karışım için µ en /ρ verilerini içeren çevrimiçi veya yazılıma gömülü tablolar literatürde mevcuttur [5].…”

Section: Introductionunclassified

Monte Carlo Estimation of Mass Energy Absorption Coefficients of Some Biological Compounds

Sengul¹,

Bozkurt

2021

Süleyman Demirel Üniversitesi Fen Edebiyat Fakültesi Fen Dergisi

View full text Add to dashboard Cite

Öz: Bu çalışma, insan vücudundaki organ ve dokuların bileşiminde yer alan on üç biyolojik bileşik için kütlesel enerji soğurma katsayılarının Monte Carlo yöntemi kullanılarak hesaplanmasını amaçlamaktadır. MCNP radyasyon taşıma yazılımı ile gerçekleştirilen simülasyonlarda, kare prizma şeklinde bir soğurucu malzeme üzerine paralel bir foton demeti yönlendirilerek, tek enerjili bir noktasal foton kaynak geometrisi kullanılmıştır. Problem geometrisindeki tüm bileşenler, hedef soğurucu dışındaki malzemelerde gerçekleşebilecek etkileşimleri önlemek için bir vakum küresi (r=100 cm) ile çevrelenmiştir. 10 keV-20 MeV aralığında yirmi sekiz farklı foton enerjisinde gerçekleştirilen simülasyonlar sonucunda elde edilen µ en /ρ değerleri NIST tablolarından elde edilen değerler ile kıyaslanmış ve uyumlu bulunmuştur. Bu yöntemin kütlesel enerji soğurma katsayıları literatürde yer almayan malzeme bileşimleri ve enerji değerleri için alternatif bir hesaplama aracı olarak kullanılabileceği düşünülmektedir.

show abstract

Radiation Biology for Medical Physicists

Cited by 18 publications

References 0 publications

Insights to Achieve More Accuracy for the Conventional Treatment Planning Systems

Insights to Achieve More Accuracy for the Conventional Treatment Planning Systems

UV decontamination of personal protective equipment with idle laboratory biosafety cabinets during the COVID-19 pandemic

Monte Carlo Estimation of Mass Energy Absorption Coefficients of Some Biological Compounds

Contact Info

Product

Resources

About