ABSTRAKPerisai radiasi dengan nilai koefisien atenuasi linier tinggi dan harga bahan yang ekonomis menjadi pertimbangan dalam pengembangan perisai radiasi. Bahan yang berpotensi untuk dikembangkan adalah pasir besi dan batu apung. Dalam penelitian ini dilakukan investigasi pengaruh variasi komposisi campuran agregat pasir besi-batu apung terhadap nilai densitas dan nilai koefisien atenuasi linier serta pengaruh ketebalan beton terhadap kemampuannya dalam menyerap radiasi sinar-x. Pengujian nilai koefisien atenuasi linier menggunakan berkas foton LINAC berenergi 6 MV dan 10 MV. Pencocokan kurva regresi linier (linear fitting curve) digunakan dalam penentuan nilai koefisien atenuasi linier. Hasil penelitian menunjukkan bahwa semakin besar nilai densitas beton uji maka nilai koefisien atenuasi liniernya semakin meningkat. Nilai densitas beton tertinggi dimiliki oleh material beton C5 yaitu 2,03 g/cm3. Material beton C5 memiliki nilai koefisien atenuasi linier tertinggi yaitu 0,0524 cm-1 dengan nilai HVL 13,23 cm dan 0,0419 cm-1 dengan nilai HVL 16,54 cm untuk energi 6 MV dan 10 MV. Kata kunci: beton; HVL; koefisien atenuasi linier; sinar-x. ABSTRACTRadiation shields with high linear attenuation coefficient values and economical material prices are considered in the development of radiation shields. Materials that have the potential to be developed are iron sand and pumice. In this research, we investigated the effect of variations in the composition of the iron sand-pumice aggregate mixture on the density value and the linear attenuation coefficient value as well as the effect of concrete thickness on its ability to absorb x-ray radiation. Testing the value of the linear attenuation coefficient using LINAC photon beams with energies of 6 MV and 10 MV. Linear fitting curve is used in determining the linear attenuation coefficient value. The results showed that the greater the density value of the test concrete, the higher the linear attenuation coefficient value. The highest concrete density value is owned by C5 concrete material, which is 2.03 g/cm3. C5 concrete material has the highest linear attenuation coefficient value of 0.0524 cm-1 that other sample with an HVL value of 13.23 cm and 0.0419 cm-1 with an HVL value of 16.54 cm respectively for 6 MV and 10 MV energies. Keywords: concrete; HVL; linear attenuation coefficient; X-ray.
ABSTRAKPenelitian ini bertujuan untuk mengevaluasi hasil simulasi TPS teknik 3DCRT pada kasus kanker payudara agar sesuai dengan standar yang diizinkan International Commission on Radiation Units and Measurements (ICRU). Proses TPS menggunakan program Eclipse dengan algoritma Anisotropic Analytical Algorithm. Kurva histogram dosis volume kumulatif 3DCRT dianalisis untuk mendapatkan dosis radiasi yang diterima organ at risk (OAR) paru-paru kiri, paru-paru kanan dan jantung. Hasil TPS menunjukkan dosis yang diterima OAR berada di bawah batas ambang yang ditentukan yaitu paru-paru kiri dengan mean dose 54,7 cGy yang melingkupi volume 1238,5 cm3 dan pada paru-paru kanan dosis mean dose 2113,2 cGy melingkupi volume 1474,5 cm3 serta pada jantung mean dose 96,5 cGy melingkupi volume 175,5 cm3. Simulasi TPS yang dilakukan berhasil mendapatkan data perencanaan penyinaran kasus kanker payudara yang memenuhi syarat dosis relatif yang melingkupi volume PTV yang diizinkan ICRU (volume terlingkupi 95%-107%) yaitu besarnya dosis relatif untuk target sebesar 95% yang melingkupi 95,5% volume target. Kata kunci: radioterapi, TPS, dosis, PTV, OAR. ABSTRACTThis study objective is to evaluate the simulation results of the 3DCRT technique TPS in breast cancer cases to conform to the standards permitted by the International Commission on Radiation Units and Measurements (ICRU). The TPS process uses the Eclipse program with the Anisotropic Analytical Algorithm algorithm. The 3DCRT cumulative dose-volume histogram curve was analyzed to obtain the absorbed dose received by the organ at risk (OAR) of the left lung, right lung and heart. The TPS results show that the dose received by OAR was below the prescribed threshold of the left lung with a mean dose of 54.7 cGy covering a volume of 1238.5 cm3 and to the right lung the mean dose of 2113.2 cGy surrounding the volume of 1474, 5 cm3 and at the heart the mean dose of 96.5 cGy covers a volume of 175.5 cm 3. TPS simulation carried out successfully obtained data on the planning of radiation from breast cancer cases that met the relative dosage requirements that covered the volume of PTV permitted by ICRU (95% -107% enclosed volume), that is, the relative dose for the target of 95% which covered 95.5% of the target volume. Keywords: radiotherapy, TPS, dose, PTV, OAR.
Linac (linear Accelerator) is a radiotherapy device that utilizes high energy radiation to kill cancer cells. Every radiotherapy equipment such as Linac must be calibrated periodically. One of them is monthly quality control which aims to test the performance of Linac so that the quality of the output of the radiation beam can be guaranteed. Quality control conducted covers measurement of Percentage Depth Dose (PDD) and Dose Profile. So that in this paper we will analyze the electron beam of Linac Therapeutic Clinics Variants plane of RSUD Provinsi NTB. In PDD measurements, the Linac Variant Clinac CX electron beam energy 4, 6, 9, 12, and 15 MeV planes are used in the radiation field size 15 15 cm 2 . Meanwhile, the dose profile was measured in the radiation fields 10 10 cm 2 and 25 25 cm 2 using blue phantom, (reference and field) detectors which are equipped with a computer control units (CCU) and carried out for crossline and inline directions at Dmax depth and certain depth with 100 cm SSD. The measurement results show that the greater the electron energy used, the maximum dose (Dmax) obtained is getting smaller, but the maximum dose depth increase. The measurement results are still within the tolerance range of ± 0.2. While the results of the Dose Profile measurements show a field size of 25 25 cm 2 more flatness and symmetry than a 10 10 cm 2 field both for inline and crossline directions and still within measurement tolerances limit 4.5% - 7% for flatness and 2 % for symmetry.
ABSTRAKDosis radiasi Sinar-X pada pemeriksaan radiologi dihitung berdasarkan dosis permukaan kulit yang diterima pasien. Hal tersebut dilakukan sebagai evaluasi terhadap pemberian dosis radiasi. Penelitian ini bertujuan untuk mengembangkan sistem aplikasi berbasis web dalam menghitung estimasi dosis radiasi permukaan kulit pasien yang diberi nama AHD Rad. Metode penelitian dilakukan dengan desain rancangan pengembangan, dan pengambilan data berupa nilai faktor eksposi. Dilakukan uji komparasi dosis radiasi antara AHD Rad dan software CALDose_X versi 5.0. Perhitungan dosis radiasi pada AHD Rad menggunakan pendekatan matematis dan fisika merujuk kepada Technical Report Series International Atomic Energy Agency (TRS IAEA) 457 tahun 2007. Data nilai faktor eksposi dengan parameter tegangan tabung (kV), arus tabung (mAs) dan jarak tabung ke film (FFD) yang sama, di masukkan melalui aplikasi CALDose_X versi 5.0 dan AHD Rad. Jumlah data sebanyak 50 dengan pengambilan data secara random sampling pada pemeriksaan radiografi umum. Pengolahan data menggunaan SPSS 11. Uji komparasi dilakukan dengan margin error 5 % dengan tingkat kepercayaan 95 %. Hasil menunjukkan nilai tidak terdapat perbedaan signifikan pada uji komparasi yang dilakukan pada aplikasi AHD Rad dengan CALDose_X versi 5.0. Sehingga aplikasi AHD Rad dapat dipergunakan dalam estimasi dosis radiasi pasien. .Kata kunci: Dosimetri; Dosis Radiasi Permukaan Kulit; AHD Rad ABSTRACTX-ray radiation dose in a radiological examination is calculated based on the skin surface dose received by the patient. This is done as an evaluation of the radiation dose. This study aims to develop a web-based application system for calculating the estimated dose of radiation to the patient's skin surface, which is named AHD Rad. The research method was carried out with a development design and data collection in exposure factor values. A comparative test of radiation dose was conducted between AHD Rad and CALDose_X software version 5.0. Calculation of radiation dose on AHD Rad using mathematical and physical approaches refers to the Technical Report Series International Atomic Energy Agency (TRS IAEA) 457 in 2007. Exposure factor value data with tube voltage parameters (kV), tube current (mAs), and tube distance to film (FFD), entered through the CALDose_X application version 5.0 and AHD Rad. The number of data is 50 by taking data by random sampling on general radiographic examination. Data processing using SPSS 11. The comparison test was carried out with a margin of error of 5% with a 95% confidence level. The results show no significant difference in the comparison test carried out on the AHD Rad application with CALDose_X version 5.0 so that the AHD Rad application can be used to estimate the patient's radiation dose. Keywords: Dosimetry; Skin Surface Radiation Dose; AHD Rad.
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