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All Journal BERKALA FISIKA Jurnal Natur Indonesia Indonesian Physical Review Jurnal Fisika dan Terapannya Jurnal Radiografer Indonesia
Syamsir Dewang
Physics Department, Faculty of Mathematics and Natural Sciences, Hasanuddin University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Health Professions Physics

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Penentuan Margin Planning Target Volume (PTV) Radioterapi dengan Teknik IMRT Kasus Kanker Nasofaring Sitti Fathul Jannah; Dewang, Syamsir; Male, Satrial
JRI (Jurnal Radiografer Indonesia) Vol. 7 No. 2 (2024): November
Publisher : Perhimpunan Radiografer Indonesia (PARI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55451/jri.v7i2.292

Abstract

Background: This research was conducted to determine PTV margins from the results of geometry verification using 3 calculation formulas for nasopharyngeal cancer cases with Intensity Modulated Radiation Therapy (IMRT) techniques and recommend the most suitable calculation method for determining PTV margins. Verification is important to determine whether there is a shift in radiotherapy planning. Geometry errors or shifts were analyzed to obtain PTV margin values and reduce setup errors including systematic and random errors. Methods: This type of research is quantitative research with interactive methods, interviews, documentation, and data collection of patient verification results. Geometry verification was carried out 3 times in the first fraction, 10th fraction, and 20th fraction using Electronic Portal Imaging Device (EPID) for nasopharyngeal cancer (KNF) cases at Radiotherapy Installation Pelamonia Hospital Makassar. Results: The results showed that the random error was greater than the systematic error, indicating that it is more difficult to correct the random error due to its changing value. This occurs due to the movement of the organ around the target. Conclusions: The PTV margin values in each formula were found to be 10.31 cm x-axis; 8.47 cm y-axis; and 60.34 cm z-axis using the Van Herk formula. The PTV margin using Stroom formula was 8.79 cm x axis; 7.15 cm y-axis; and 51.47 cm z-axis. The PTV margin using the ICRU 62 formula was 4.90cm x axis; 3.75cm y-axis; and 28.92cm z-axis. Van Herk's formula PTV margin is recommended based on the lowest percentage shift that lies outside the PTV margin.
EVALUASI INDEKS GAMMA PADA TEKNIK PENYINARAN INTENSITY MODULATED RADIATION THERAPY (IMRT) UNTUK KANKER PAYUDARA MENGGUNAKAN ELECTRONIC PORTAL IMAGING DEVICE (EPID) Ariguntar, Astrid; Dewang, Syamsir; Astuty, Sri Dewi; Saleha, Saleha
BERKALA FISIKA Vol 28, No 1 (2025): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Studi ini bertujuan untuk mengevaluasi indeks gamma pada Intensity Modulated Radiation Therapy (IMRT) untuk kanker payudara menggunakan Electronic Portal Imaging Device (EPID). Hasil penelitian didapatkan pada verifikasi indeks gamma pada lima pasien kanker payudara didapatkan pada pasien 1 dengan nilai GPR 86%±0,24, pasien 2 dengan nilai GPR 74%±0,17, dan pasien 4 dengan nilai GPR 87%±0,21. Adapun pasien 3 dan 5 memiliki nilai GPR ≥95% yang mendapatkan masing-masing 100% dan 99% dengan nilai Standar Deviasi ≤1. Berdasarkan hasil tersebut, EPID dapat digunakan sebagai alat dosimetri yang efektif untuk evaluasi distribusi dosis secara real-time. Dengan verifikasi ini, diharapkan tingkat keakuratan penyinaran dapat ditingkatkan, sehingga efektivitas terapi pada pasien kanker payudara menjadi lebih optimal.
ANALISIS MODULATION TRANSFER FUNCTION (MTF) DAN CONTRAST-TO-NOISE RATIO (CNR) CITRA CT SCAN UNTUK OPTIMASI KUALITAS CITRA Azhara, Mutiara Fatimah; Dewang, Syamsir; Rosyidah, Ulfah; Astuty, Sri Dewi; Somad, Bannu Abdul
BERKALA FISIKA Vol 28, No 1 (2025): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Salah satu parameter utama dalam kualitas citra CT scan untuk penegakan diagnosa adalah   resolusi kontras tinggi, yang dinyatakan dengan Modulation Transfer Function (MTF) dan resolusi kontras rendah, yang dinyatakan dalam contrast-to-noise ratio (CNR). MTF dan CNR menjadi kriteria penting untuk membandingkan protokol dosis tinggi dan dosis rendah, yang bergantung pada karakteristik obyek target. MTF mengkarakterisasi tingkat keburaman pada domain frekuensi sedangkan CNR mengkuantifikasi detektabilitas objek-objek kontras rendah. Penelitian ini menggunakan fantom American Association of Medical Physicists in Medicine (AAPM) sebagai obyek dengan variasi arus tabung dan tebal irisan. Citra dianalisis dengan software Radiant DICOM dan IndoQCT. Pengukuran dilakukan dengan dua variasi yaitu arus tabung 100, 130 dan 150 mA pada tegangan tabung 80 kV dan tebal irisan 2,5 mm. Sedangkan untuk variasi tebal irisan 1,25, 3,75, dan 5 mm pada tegangan tabung 80 kV dan arus tabung 125 mA. Hasil penelitian menunjukkan nilai MTF10 masing-masing variasi arus tabung berturut-turut 0,7 line/mm; 0,7 line/mm; dan 0,8 line/mm. Nilai MTF masing-masing variasi tebal irisan sama yaitu 0,7 line/mm. Nilai CNR pada variasi arus tabung sebesar 2,548; 3,016; dan 3,482 serta pada variasi tebal irisan diperoleh 2,308; 2,613; dan 2,735. Semakin besar nilai arus tabung dan tebal irisan, maka nilai MTF semakin tinggi demikian pula untuk nilai CNR.
Analisis Nilai Entrance Skin Dose (ESD) dan Dosis Hamburan pada Area Tiroid dan Area Gonad pada Phantom PMMA Planar Menggunakan Pesawat Fluoroskopi C-Arm Asmayati; Astuty, Sri Dewi; Prastowo, Alan Tanjung Aji; Dewang, Syamsir; Ibrahim, Ajeng Anggreny; Pratiwi, Ayu Hardianti
JFT : Jurnal Fisika dan Terapannya Vol 12 No 1 (2025): Juni 2025
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v12i1.55995

Abstract

A study has been conducted analyzing the Entrance Skin Dose (ESD) value on PMMA phantoms based on variations in Field of View (FOV) and thickness. In addition, the magnitude of the dose scattering that reaches the thyroid and gonad areas of radiation workers when C-Arm fluoroscopy examination is performed was also tested. The variation in phantom thickness values ​​was 15, 20, and 25 cm while the variation in FOV irradiation values ​​was 12, 15, 17, and 20 cm. The purpose of the study was to determine the magnitude of the change in ESD value due to changes in object thickness which will also directly affect changes in peak voltage for each irradiation. This also has implications for providing an increasing scattering dose due to the presence of the object. The results showed that the larger the FOV and thickness of the phantom, the higher the ESD value received. At a phantom thickness of 25 cm, ESD increased from 6.42 mGy at a FOV of 12 cm to 11.61 mGy at a FOV of 17 cm. The scatter dose value that reaches the thyroid area is a maximum of 22.31 µSv at FOV 20 cm, while the gonad area receives 1.647 µSv, which is lower because the fluoroscopy machine is equipped with Pb protection for radiation workers when performing interventions. The conclusion in C-arm fluoroscopy examinations, radiation workers must also use protective equipment for other vital areas such as Pb glasses and neck protection to be safer from scattered radiation.
Pembuatan dan Uji Nilai HU Jaringan Tulang Buatan Berbahan Dasar Cangkang Telur Eunike Yusmaliani; Astuty, Sri Dewi; Purwanto; Dewang, Syamsir; Bannu; Ibrahim, Ajeng Anggreny; Pratiwi, Ayu Hardianti
JFT : Jurnal Fisika dan Terapannya Vol 12 No 1 (2025): Juni 2025
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v12i1.58374

Abstract

Performance evaluation of diagnostic radiology modalities strongly supports the quality of radiation and images for diagnosis. This test requires certain materials as a substitute for human objects to avoid excessive radiation. Phantom as one of the object replacement media has been directed according to the characteristics of the tissue. This study aims to obtain the radiation response of artificial bone tissue made from eggshells with the addition of rice bran, resin and catalyst, in 4 (four) mixture compositions. Test variations were carried out by changing the X-ray tube voltage (80 kV, 100 kV, 120 kV and 140 kV) to obtain CT-Scan images and analyzed using Radiant DICOM software. The results showed that the Hounsfield unit (HU) value of the artificial bone phantom corresponded to the HU value range of real bone organs, which is between 100 and 700 HU. This value affects the analysis of the resulting image resolution in the form of SNR and CNR values, in the range of (8.07-37.38) and (14.98-28.20), respectively. Conclusion Artificial bone tissue phantom made from eggshells and rice bran has the potential as a testing medium because it corresponds to the characteristics of human bones, especially in adulthood, and has the potential as a testing medium.
QUALITY CONTROL OF MULTI-SLICE CT-SCAN AIRCRAFT USING PHANTOM CHART MODEL 610 AT MAKASSAR HAJI HOSPITAL Fira, Nurul Magfirawati; Dewang, Syamsir; Astuty, Sri Dewi; Muliadin, Muliadin
Indonesian Physical Review Vol. 5 No. 1 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i1.136

Abstract

This study aims to determine and analyze the quality control phantom chart of a CT-scan plane from the CT number's accuracy, the CT number's uniformity, and the uniformity of noise against the phantom. The AAPM CT Performance Phantom with the model 610 offers a single object to measure several different CT performance parameters. The Phantom design is based on the guidelines presented in the AAPM. From the measurement results, the accuracy of the CT number is still following the tolerance standard; namely, the value of passing the test ± 4 for the accuracy of the CT number, and the value of passing the test 2 is the uniformity of the CT number. Based on the Standard Regulations of the Head of the Nuclear Energy Supervisory Agency, stating that the value of accuracy and uniformity of the CT number from the CT scan image obtained in research conducted on a multi-slice CT scan plane at the Radiology Installation of the Makassar Haji Regional General Hospital shows the value of passing the test or still within PERKA BAPETEN standard.
IDENTIFIKASI LEVEL NOISE, RESOLUSI SPASIAL DAN LOW CONTRAST CITRA CT SCAN PADA OBJEK FANTOM RAHIM BUATAN Gunawan, Mutiara; Astuty, Sri Dewi; Dewang, Syamsir; Purwanto, Purwanto
BERKALA FISIKA Vol 27, No 2 (2024): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Kontrol kualitas radiasi maupun kualitas citra memegang peranan penting dalam uji kelayakan klinis suatu modalitas pesawat radiologi. Quality Control (QC) dilakukan untuk mematuhi standar yang diijinkan baik terhadap keluaran radiasi maupun hasil citra yang optimal untuk mendukung penegakan diagnosa. CT-scan merupakan salah satu perangkat diagnostik yang memerlukan pengujian QC citra medis yang kompleks karena memiliki banyak indikator penilaian seperti resolusi spasial, low contrastt, keseragaman noise, uniformity dan linearitas. Salah satu implementasi edukasi untuk penelitian terkait penggunaan radiasi adalah uji kualitas citra menggunakan fantom rahim buatan berbahan dasar agar, plastisin dan gel. Bagian dalam fantom diasumsikan sebagai jaringan kista (gumpalan darah lebih fluid), lesi (gumpalan darah lebih padat) dan kantung rahim (berisi air). Penelitian bertujuan untuk mengetahui kualitas citra CT-Scan fantom rahim berdasarkan nilai level noise, resolusi spasial (SNR) dan low contrastt (CNR dan MTF). Hasil penelitian menunjukkan bahwa tegangan 80 - 120 kV menghasilkan nilai SNR antara 5,72  - 6,60. Nilai CNR untuk jaringan kantung rahim berisi cairan sebesar 6,77, untuk jaringan lesi sebesar 19,56 dan untuk jaringan kista sebesar 192,15. Karakteristik nilai CTN untuk setiap objek yang diuji mendekati nilai jaringan yang sebenarnya dengan hasil uji kualitas citra fantom meningkat dengan
Co-Authors Ajeng Anggreny Ibrahim, Ajeng Anggreny Ariguntar, Astrid Arty, Nindy Asmayati Azhara, Mutiara Fatimah Bannu Eunike Yusmaliani Fira, Nurul Magfirawati Gunawan, Mutiara Jumriah, Jumriah Khairul Bariah Male, Satrial Marwah, Siti Ainun Muliadin, Muliadin Mulyadin, Mulyadin Mutmainna, Azri Prastowo, Alan Tanjung Aji Pratiwi, Ayu Hardianti Purwanto Purwanto Purwanto Rauf, Resmy Aulyah Rifaldi Rifaldi, Rifaldi Rosyidah, Ulfah S, Nurhidayanti S., Hikmawati Saharani, Nanda Salama, Rahmatullah Saleha Saleha Sitti Fathul Jannah Somad, Bannu Abdul Sri Dewi Astuty Ilyas Sulistiana Sulistiana, Sulistiana