An estimate of patient dose, patient size should be used to normalise the output dose of CT machine in the terms of volume CT dose index, CTDIvol. There are two metrics to characterise the patient size, i.e. the effective diameter (Deff) and the water-equivalent diameter (Dw). These two metrics could be estimated by patient age. However, to date, relationships between the age and head patient size (Deff and Dw) have not been established for the pediatric patients. The aim of this study was to establish the relationships between the age and head patient size (Deff and the Dw) as the basis for calculating the size-specific dose estimate (SSDE) for paediatric head CT examination. The data were retrospectively collected from serial images of the CT head in the DICOM file from one hundred and thirteen paediatric patients aged 0-17 years (63 male and 50 female patients) underwent head CT examinations. The patient’s sizes (Deff and Dw) were calculated from the patient’s images using the IndoseCT version 15a software. The Deff and Dw values were correlated with age of patients using regression analysis. It was found that patient size (Deff and Dw) correlated well with the age of the patient with R2 more than 0.8. The size of the Dw is bigger than the Deff. The Deff values for male patients are 12.38 to 16.21 cm, and Dw values are 11.96 to 18.16 cm, respectively. For female patients, the values of Deff are from 11.54 to 16.87 cm, and the values of Dw are from 11.60 to 17.86 cm, respectively.
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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