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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Penelitian Pendidikan IPA (JPPIPA)
Johan Andoyo Effendi Noor
Universitas Brawijaya
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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Estimation of the k-Value for Head CT Using ICRP-103 Tissue Weighting Factors Johan Andoyo Effendi Noor; Risalatul Latifah; Firdy Yuana
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 11 No. 2 (2021)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v11n2.p179-188

Abstract

Multi-slice x-ray CT scanners are in highly use by physicians to assist them in diagnosing patients disease due to advances in their scanning speed, image processing and image quality. However, this trend results in patients being exposed to many fold higher doses compared to those for general x-ray radiography. This makes CT machines the major source of unwanted dose to the population from medical x-ray procedures. The CTDIvol and DLP parameters are quantities of concern in radiation protection measures. This study was aimed to examine the effective dose received by patients underwent head CT procedures In this paper we present our estimation of the k-value calculated from the DLP from the CT machine in the participating hospital using the ICRP 103 weighted tissue factor. Dose parameters were acquired from the machine and calculations were carried out using the ImPACT CTDosimetry software. We also compared the received doses by age and gender groups. We found that the doses are dissimilar between age groups and between male and female patients.
Analysis of Gray Matter Volume (GMV) and White Matter Hyperintensity (WMH) in Ischemic Stroke Patients with Fluid Attenuated Inversion Recovery (FLAIR) Imaging Ade Lina Nur Fadlilah; Johan Andoyo Effendi Noor; Yuyun Yueniwati; Karimah
Jurnal Penelitian Pendidikan IPA Vol 9 No 7 (2023): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i7.3377

Abstract

Stroke is a serious health problem faced by almost all over the world. The occurrence of ischemic stroke could affect the gray matter volume (GMV) in the human brain. In Magnetic Resonance imaging of an ischemic stroke with a FLAIR sequence, a white lesion known as the white matter hyperintensity (WMH) is often found. We studied correlation between gray matter volume (GMV) and white matter hyperintensity (WMH) in ischemic stroke patients using fluid attenuated inversion recovery (FLAIR) sequences. The MRI data were taken randomly from ten ischemic stroke patients (mean age 46.9 years) and ten normal patients (mean age 36.8 years). FLAIR axial image parameters, i.e. TE (time echo), TR (time repetition), and TI (time inversion) were analyzed. The results reveal that the TE and TR values in FLAIR images of normal and ischemic stroke patients are classified as long TE (more than 70 ms), long TR  (more than 1500 ms) and long TI (more than 1700 ms). The mean GMV of ischemic stroke patients (1.371 cm3) is smaller than the GMV of normal patients (2.267 cm3). This is related to the presence of white matter hyperintensity (WMH) in ischemic stroke patients
Co-Authors Ade Lina Nur Fadlilah Firdy Yuana Karimah Risalatul Latifah Yuyun Yueniwati