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All Journal Spektra: Jurnal Fisika dan Aplikasinya Jurnal Pembelajaran Fisika
Ni Larasati Kartika Sari
Universitas Nasional
Aerospace Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics Social Sciences

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ANALYSIS OF THE EFFECT OF CARE DOSE 4D SOFTWARE USE ON IMAGE QUALITY AND RADIATION DOSE ON THE CT SCAN ABDOMEN Ni Larasati Kartika Sari; Merry Suzana; Muzilman Muslim; Dewi Muliyati
Spektra: Jurnal Fisika dan Aplikasinya Vol 5 No 1 (2020): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 5 Issue 1, April 2020
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (314.613 KB) | DOI: 10.21009/SPEKTRA.051.04

Abstract

The CT Scan is the most significant contributor to radiation dose on radiological examination, although the frequency of the examination is far below other modalities. In order to control this radiation dose, manufactures of CT Scan have equipped their units with built-in software called Automatic Exposure Control (AEC). This study aims to analyze the effect of AEC software, CARE Dose 4D, on image quality, and CTDIvol. Objects used in this study were three water phantoms, each with a diameter of 165 mm, 230 mm, and 305 mm. The image quality-analyzed was CT Number and noise. Measurement of image quality was carried out following Bapeten's provisions. Noise Power Spectrum (NPS) graphics were also used to further observes noise texture. The CT Number accuracy, CT Number, and noise uniformity obtained with and without CARE Dose 4D, on the three phantoms were still within Bapeten's threshold. This indicates that the use of CARE Dose 4D can still image a homogeneous object accurately. The results of the NPS curve showed that the two modes, in three phantoms, were having the same noise texture. The NPS curves also showed that the use of CARE Dose 4D produces higher noise than the non-CARE Dose 4D mode. Meanwhile, there were significant differences from the CTDIvol obtained from the two modes. The use of CARE Dose 4D software reduced dose of up to 54.34%. From this, the use of CARE Dose 4D software can reduce the radiation dose while maintaining image quality.
ANALISIS KARAKTERISTIK SEGMEN PADA CITRA MAMOGRAFI DENGAN MENGGUNAKAN METODE SEGMENTASI WATERSHED Ni Larasati Kartika Sari; Puji Hartoyo; Ajrun Ajrun
JURNAL PEMBELAJARAN FISIKA Vol 11 No 2 (2022): Jurnal Pembelajaran Fisika (JPF) Universitas Jember
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (383.999 KB) | DOI: 10.19184/jpf.v11i2.31643

Abstract

Breast cancer is the most common cancer and is a major cause of women worldwide. Early examination of breast cancer is done by mammography. Mammographic images were analyzed manually by radiologists. That is in the manual system, but can help with digital image processing systems known as Computer-Aidid Diagnostics (CAD). One of the digital image processing is segmentation. segmentation is an object for object objects with a background (background) contained in an image. Segmented segmentation, namely watershed. Image segmentation is presented as a different area from the initial image as relief topography. This study uses 125 images which are divided into 100 image databases and 25 test data images. After testing with watershed, measurements were taken using Receiver Operating Characteristic (ROC). Based on testing, obtained pixel values ​​and minor and major ratios of 171.72 and 0.64. The values, sensitivity and specificity of the program were 46.00%, 45.00% and 68.00% respectively.
PENERAPAN SSDE-DIAMETER EKUIVALEN AIR SEBAGAI TINGKAT PANDUAN DIAGNOSIS TYPICAL VALUE PADA PEMERIKSAAN CT SCAN ABDOMEN PEDIATRIK Ni Larasati Kartika Sari; Rahayugo Rahayugo; Budi Santoso; Puji Hartoyo
JURNAL PEMBELAJARAN FISIKA Vol 12 No 2 (2023): Jurnal Pembelajaran Fisika (JPF) Universitas Jember
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jpf.v12i2.39048

Abstract

Diagnostic Reference Level (DRL) is a method of optimizing patient doses in diagnostic and intervention procedures. The DRL value is obtained from the Volumetric Computed Tomography Dose Index (CTDIvol) which is obtained from a phantom with a diameter of 16 cm or 32 cm, so it is not yet possible to accurately estimate the dose for each patient, especially pediatric patients. The American Association of Physicists in Medicine (AAPM) then issued a water equivalent diameter (Dw) parameter to calibrate the CTDIvol to obtain a Size-Specific Dose Estimate (SSDE) so that it is more specific and effective. This study aims to obtain local DRL values ​​and compare local DRL values ​​in two pediatric age groups. This study used data from 25 pediatric abdominal CT scan patients aged <15 years, divided into two groups, ages 0-4 years and ages 5-15 years. The results of this study showed that typical DRLCTDIvol values ​​for ages 0-4 years and 5-15 years were 3.09 mGy and 4.39 mGy respectively, while DRLSSDE for the two age groups were 3.25 mGy and 3.54 mGy respectively. There is a difference of 5.27% and 19.36% respectively from the local DRL value based on CTDIvol and SSDE for the two age groups. It can be seen that in the 0-4 year age group, the DRLSSDE value is greater than the DRLCTDIvol, conversely in the 5-15 year age group the DRLSSDE value is lower than the DRLCTDIvol which indicates that the dimensional factor affects the dose received by the patient.
Co-Authors Ajrun Ajrun Budi Santoso Dewi Muliyati Merry Suzana Muzilman Muslim Puji Hartoyo Rahayugo Rahayugo