scholarly journals Pemetaan Laju Dosis Radiasi-γ pada Pesawat Teleterapi 60Co

2020 ◽  
Vol 5 ◽  
Author(s):  
S Choiriyah ◽  
N Sabrina ◽  
Riyatun Riyatun ◽  
Suharyana Suharyana ◽  
Muhtarom Muhtarom ◽  
...  
Keyword(s):  
Dose Rate ◽  
Ionization Chamber ◽  
Depth Information ◽  
Average Dose ◽  
Measuring Instrument ◽  
Γ Radiation ◽  
Rate Distribution ◽  
Percentage Depth Dose ◽  
Depth Dose

<p class="AbstractEnglish"><strong>Abstact: </strong>Radiotherapy <sup>60</sup>Co is a method of therapy cancer by radiation γ.  Teletherapy <sup>60</sup>Co at RSUD Dr. Moewardi, the collimator opening area can be adjusted to (10 x 10) cm and the distance between source and surface target (SSD) is 80 cm. γ- radiation emitted by the <sup>60</sup>Co source will spread from the collimator to the target in a cone shape so that information about the dose rate receive by patient is needed to support the accuracy of the dose in radiotherapy. To support cancer radiotherapy at a certain depth, information is needed about the dose rate at various phantom depth, the average dose rate and the quality of the dose rate distribution. By using an ionization chamber detector placed at various phantom depth and positions, information can be recorded. PDD (percentage depth dose) of radiation with energy 1,3 MeV, the largest value is at a depth of 6,5 cm, at this depth the measured umbra area is (7,8 x 7,8)cm with an average dose rate of 0,6034 Gy/menit. As the depth of measuring instrument increases, the dose rate measured will decrease exponentially, while the umbra are at the phantom depth is relatively constant.</p><p class="AbstrakIndonesia"><strong>Abstrak: </strong>Radioterapi <sup>60</sup>co merupakan salah satu metode pengobatan kanker dengan cara menembakkan radiasi γ pada sel kanker. Pesawat teleterapi <sup>60</sup>Co di RSUD Dr. Moewardi, luas bukaan kolimator dapat diatur menjadi (10 x 10) cm dan jarak sumber dengan permukaan target (SSD) adalah 80 cm. Radiasi- γ yang dipancarkan oleh sumber <sup>60</sup>Co akan menyebar dari kolimator ke target dengan berbentuk konus sehingga informasi tentang laju dosis yang diterima pasien sangat diperlukan untuk mendukung ketepatan dosis dalam radioterapi. Untuk mendukung radioterapi kanker pada kedalaman tertentu, diperlukan informasi tentang laju dosis pada variasi kedalaman <em>phantom</em>, laju dosis rata-rata dan kualitas sebaran laju dosis. Dengan menggunakan detektor <em>ionization chamber </em>yang diletakkan pada berbagai kedalaman dan posisi <em>phantom,</em> informasi dapat direkam. PDD (<em>percentage depth dose</em>) dari radiasi-γ berenergi 1,3 MeV terbesar nilainya  pada kedalaman 6,5 cm, pada kedalaman ini luas umbra yang terukur yaitu (7,8 x 7,8) cm dengan laju dosis rata-rata 0,6034 Gy/menit. Dengan bertambahnya posisi kedalaman letak alat ukur, laju dosis yang terukur akan menurun secara eksponensial, sedangkan luas umbra pada kedalaman fantom relatif tetap. </p>

Percentage depth dose fragmentation for investigating and assessing the photon beam dosimetry quality

2018 ◽  
Vol 18 (03) ◽  
pp. 280-284 ◽  
Author(s):  
Mohamed Bencheikh ◽  
Abdelmajid Maghnouj ◽  
Jaouad Tajmouati
Keyword(s):  
Exponential Decay ◽  
Target Volume ◽  
Photon Beam ◽  
Field Size ◽  
Photon Beams ◽  
Energy Agency ◽  
Percentage Depth Dose ◽  
Depth Dose ◽  
Beam Dosimetry

AbstractAimThe purpose of this study is to introduce a new approach to assess the dosimetry quality of photon beam with energy and irradiation field size. This approach is based on percentage depth dose (PDD) fragmentation for investigating the dosimetry quality.Materials and methodsFor the investigation of the dosimetry quality of 6 and 18 MV photon beams, we have proceeded to fragment the PDD at different field sizes. This approach checks the overall PDD and is not restricted to the exponential decay regions, as per the International Atomic Energy Agency Technical Reports Series No 398 and the American Association of Physicist in Medicine Task Group 51 recommendations.Results and discussionThe 6 MV photon beam deposited more energy in the target volume than the 18 MV photon beam. The dose delivered by the 6 MV beam is greater by a factor of 1·5 than that delivered by the 18 MV beam in the build-up region and the dose delivered by the 6 MV beam is greater by a factor of 2·6 than that delivered by the 18 MV beam in the electronic equilibrium and the exponential decay regions.ConclusionThe dose measured at different points of the beam is higher for 6 MV than for 18 MV photon beam. Therefore, the 6 MV beam is more dosimetrically efficient than the 18 MV beam. Using the proposed approach, we can assess the dosimetry quality by taking into account overall PDD not only in the exponential decay region but also in the field.

Longitudinal Changes in Health-related Quality of Life After 125I Low-dose-rate Brachytherapy for Localized Prostate Cancer

2020 ◽  
Vol 40 (11) ◽  
pp. 6443-6456
Author(s):  
NAOYUKI OGASAWARA ◽  
MAKOTO NAKIRI ◽  
HIROFUMI KUROSE ◽  
KOSUKE UEDA ◽  
KATSUAKI CHIKUI ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Prostate Cancer ◽  
Dose Rate ◽  
Low Dose ◽  
Health Related Quality ◽  
Low Dose Rate ◽  
Related Quality ◽  
Health Related ◽  
Low Dose Rate Brachytherapy

Analisis Pengalaman Keluarga Merawat Pasien Skizofrenia dengan Masalah Halusinasi Pendengaran Pasca Hospitalisasi

2019 ◽  
Vol 4 (2) ◽  
pp. 282
Author(s):  
Isti Harkomah
Keyword(s):  
Health Services ◽  
Family Support ◽  
Depth Information ◽  
Continuous Family ◽  
Family Experience ◽  
Schizophrenic Patients ◽  
Heavy Burden ◽  
Document Review ◽  
Depth Interviews

<p><em>Clients with hallucinations really need continuous family support both internal and external families. Reduced external family support will cause a heavy burden on the internal family in caring for hallucinatory clients. The reason families bring to the hospital is the inability to treat patient hallucinations at home after hospitalization because hallucinations pose a burden on the family. The purpose of this study was to find out in-depth information about family experience in treating schizophrenic patients who experience auditory hallucinations after hospitalization. This research is qualitative research, the phenomenology approach uses the method of collecting data by in-depth interviews and document review. Data were obtained by in-depth interviews with six participants. The results of the study are two main themes, namely family understanding of recognizing hallucinatory problems after hospitalization and family experience in treating schizophrenic patients with hallucinatory problems.It is hoped that health services will further improve the quality of health services in providing health education to families about how to properly care for hallucinatory patients and families are expected to be able to treat hallucinogenic patients well.</em></p><p><em><br /></em></p><p><em><em>Klien dengan halusinasi sangat membutuhkan dukungan dari keluarga secara terus menerus baik keluarga internal maupun eksternal. Berkurangnya dukungan keluarga eksternal akan menimbulkan beban yang berat bagi keluarga internal dalam merawat klien halusinasi. Alasan keluarga membawa ke RSJ adalah ketidakmampuan merawat halusinasi pasien dirumah pasca rawat inap karena halusinasi menimbulkan beban bagi keluarga. Tujuan penelitian ini adalah untuk mengetahui informasi mendalam tentang pengalaman keluarga dalam merawat pasien skizofrenia yang mengalami masalah halusinasi pendengaran pasca hospitalisasi. Penelitian ini merupahkan penelitian kualitatif, pendekatan fenomenologi menggunakan metode pengumpulan data dengan wawancara mendalam dan telaah dokumen. Data didapatkan dengan wawancara mendalam terhadap enam partisipan. Hasil wawancara dianalisis dengan menggunakan metode Collaizi. Hasil penelitian yaitu terdapat 2 utama tema yaitu pemahaman keluarga tentang mengenal masalah halusinasi pasca hospitalisasi dan pengalaman keluarga dalam merawat pasien skizofrenia dengan masalah halusinasi.Diharapkan bagi pelayanan kesehatan agar lebih meningkatkan mutu pelayanan kesehatan dalam memberikan pendidikan kesehatan kepada keluarga tentang cara merawat pasien halusinasi yang benar dan keluarga diharapkan dapat merawat pasien halusinasi dengan baik.</em></em></p>

scholarly journals Pulsed Dose Rate Brachytherapy of Lip Carcinoma: Clinical Outcome and Quality of Life Analysis

Cancers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1387
Author(s):  
Radouane El Ayachy ◽  
Roger Sun ◽  
Kanta Ka ◽  
Adrien Laville ◽  
Anne-Sophie Duhamel ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Dose Rate ◽  
Therapeutic Option ◽  
Local Control Rate ◽  
Local Failure ◽  
Life Assessment ◽  
Grade Ii ◽  
Lip Carcinoma ◽  
Pulsed Dose Rate

Purpose: Lip carcinoma represents one of the most common types of head and neck cancer. Brachytherapy is a highly effective therapeutic option for all stages of lip cancers. We report our experience of pulsed dose rate brachytherapy (PDR) as treatment of lip carcinoma. Methods and Materials: this retrospective single center study included all consecutive patients treated for a lip PDR brachytherapy in our institution from 2010 to 2019. The toxicities and outcomes of the patients were reported, and a retrospective quality of life assessment was conducted by phone interviews (FACT H&N). Results: From October 2010 to December 2019, 38 patients were treated in our institution for a lip carcinoma by PDR brachytherapy. The median age was 73, and the majority of patients presented T1-T2 tumors (79%). The median total dose was 70.14 Gy (range: 60–85 Gy). With a mean follow-up of 35.4 months, two patients (5.6%) presented local failure, and seven patients (19%) had lymph node progression. The Kaplan–Meier estimated probability of local failure was 7.2% (95% CI: 0.84–1) at two and four years. All patients encountered radiomucitis grade II or higher. The rate of late toxicities was low: three patients (8.3%) had grade II fibrosis, and one patient had grade II chronic pain. All patients would highly recommend the treatment. The median FACT H&N total score was 127 out of 148, and the median FACT H&N Trial Outcome Index was 84. Conclusions: This study confirms that an excellent local control rate is achieved with PDR brachytherapy as treatment of lip carcinoma, with very limited late side effects and satisfactory functional outcomes. A multimodal approach should help to improve regional control.

A new method for determining dose rate distribution from radioimmuno-therapy using radiochromic media

1994 ◽  
Vol 28 (2) ◽  
pp. 505-513 ◽  
Author(s):  
Rulon Mayer ◽  
Larry E. Dillehay ◽  
Yi Shao ◽  
Shiyu Song ◽  
Yong-Gong Zhang ◽  
...  
Keyword(s):  
Dose Rate ◽  
New Method ◽  
Rate Distribution

scholarly journals Quantitative Assessment of 3D Dose Rate for Proton Pencil Beam Scanning FLASH Radiotherapy and Its Application for Lung Hypofractionation Treatment Planning

Cancers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 3549
Author(s):  
Minglei Kang ◽  
Shouyi Wei ◽  
J. Isabelle Choi ◽  
Charles B. Simone ◽  
Haibo Lin
Keyword(s):  
Dose Rate ◽  
Treatment Planning ◽  
Organs At Risk ◽  
Patient Treatment ◽  
Average Dose ◽  
Clinical Implementation ◽  
Flash Intensity ◽  
Dose Threshold ◽  
Rate Calculation ◽  
The Impact

To quantitatively assess target and organs-at-risk (OAR) dose rate based on three proposed proton PBS dose rate metrics and study FLASH intensity-modulated proton therapy (IMPT) treatment planning using transmission beams. An in-house FLASH planning platform was developed to optimize transmission (shoot-through) plans for nine consecutive lung cancer patients previously planned with proton SBRT. Dose and dose rate calculation codes were developed to quantify three types of dose rate calculation methods (dose-averaged dose rate (DADR), average dose rate (ADR), and dose-threshold dose rate (DTDR)) based on both phantom and patient treatment plans. Two different minimum MU/spot settings were used to optimize two different dose regimes, 34-Gy in one fraction and 45-Gy in three fractions. The OAR sparing and target coverage can be optimized with good uniformity (hotspot < 110% of prescription dose). ADR, accounting for the spot dwelling and scanning time, gives the lowest dose rate; DTDR, not considering this time but a dose-threshold, gives an intermediate dose rate, whereas DADR gives the highest dose rate without considering any time or dose-threshold. All three dose rates attenuate along the beam direction, and the highest dose rate regions often occur on the field edge for ADR and DTDR, whereas DADR has a better dose rate uniformity. The differences in dose rate metrics have led a large variation for OARs dose rate assessment, posing challenges to FLASH clinical implementation. This is the first attempt to study the impact of the dose rate models, and more investigations and evidence for the details of proton PBS FLASH parameters are needed to explore the correlation between FLASH efficacy and the dose rate metrics.

8: Dosimetric Predictors of Toxicity and Quality of Life Following Single Fraction High Dose-Rate Prostate Brachytherapy

2021 ◽  
Vol 163 ◽  
pp. S7
Author(s):  
Mark T. Corkum ◽  
Andrew Loblaw ◽  
Hans T. Chung ◽  
Chia-Lin Tseng ◽  
Merrylee McGuffin ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Dose Rate ◽  
High Dose Rate ◽  
High Dose ◽  
Prostate Brachytherapy ◽  
Single Fraction

Effects of initial concentration and irradiation dose to degradation of di butyl phthalate from phosphoric acid (30 % P2O5)

2018 ◽  
Vol 106 (11) ◽  
pp. 909-916
Author(s):  
Louisa Bounemia ◽  
Abdelhamid Mellah
Keyword(s):  
Organic Matter ◽  
Phosphoric Acid ◽  
Optimal Recovery ◽  
Γ Irradiation ◽  
Γ Radiation ◽  
Initial Concentration ◽  
First Order ◽  
First Order Kinetics ◽  
Butyl Phthalate

Abstract The pretreatment of the phosphoric acid is a stage of utmost importance leading to an optimal recovery of the uranium present in this acid. To this end, the degradation of the organic matter which obstructs considerably this recovery was tested by γ irradiation. This study lies within the scope of the radiation/matter interaction; concerning the use of the γ irradiator as proceed of phosphoric acid purification by the degradation of di butyl phthalate (DBP). Studies of the interaction of γ radiation with phosphoric acid solutions polluted by an organic matter concern the study of the influence of some parameters such as: dose rate (0.5–35 kGy), initial concentration (50–500 mg/L) of the pollutant, pH and % in P2O5 on the degradation of organic matter by γ irradiation. The reactions followed pseudo first order kinetics for different initial concentrations. The results made it possible to say that the degradation of di butyl phthalate by γ irradiation is dependent on the amount of the concentration of DBP and pH. The G-values decreased with absorbed doses, and increased with higher initial concentrations.Purification of phosphoric acid by γ radiation does not degrade the quality of this acid.

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