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Ali Khumaeni
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Department of Physics Faculty of Science and Mathematics Diponegoro University Jl Prof Soedharto SH, Tembalang, Semarang, Indonesia
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Journal of Physics and Its Applications
Published by Universitas Diponegoro
ISSN : -     EISSN : 26225956     DOI : 10.14710
Core Subject : Science,
Astronomy Earth & Planetary Sciences Materials Science & Nanotechnology Physics
Journal of Physics and Its Applications (JPA) (e-ISSN: 2622-5956) is open access, International peer-reviewed journal that publishes high-novelty and original research papers and review papers in the field of physics including Radiation Physics, Materials, Geophysics, Theoretical Physics, Instrumentation and Electronics, Medical Physics, Biomedical Physics, Chemical Physics, Mathematical Physics, and Applied Physics. The JPA publishes two issues annually (May and November). The journal is published by Department of Physics, Faculty of Science and Mathematics, Diponegoro University, Indonesia.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 112 Documents
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Radiation Dose Optimization in Adult Head CT: A Comprehensive Review from Phantom-Based Evaluation to Clinical Implementation Inganatul Islamiyah; Yuyun Yueniwati; Chomsin Sulistya Widodo; Zaenal Arifin
Journal of Physics and Its Applications Vol 8, No 2 (2026): May 2026
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v8i2.31226

Abstract

The widespread use of head computed tomography (CT) has led to a significant increase in patient radiation dose. Although modern CT systems include dose-saving technologies, further optimization is necessary to balance radiation dose and image quality. This study aims to review dose optimization strategies in head computed tomography (CT), focusing on the impact of acquisition parameter modifications across different phantom types and their translation into clinical applications. Variations in radiation dose and image quality are quantitatively assesed using multiple phantoms. PMMA phantoms validates dose measurements, image quality phantoms enable comprehensive assessment of image metrics, and anthropomorphic phantoms ensure clinical relevance. In clinical applications, image quality is qualitatively evaluated by radiologists. Results show that tube voltage and tube current are the main strategies of dose optimization, supported by automatic exposure control, pitch adjustment, and reconstruction algorithms. Iterative reconstruction techniques effectively mitigate noise amplification due to the adjustments. Radiation dose reduction ranges from approximately 15% to 80%, depending on the applied parameter modifications. Since dose reductions often lead to increased image noise and variations in image quality, this review identifies the optimal range of parameter adjustments that maintain diagnostically acceptable image quality. Combining quantitative assessments with phantoms and qualitative evaluations by radiologists enables a more comprehensive understanding of optimization results that can greatly benefit clinical practice by serving as a long-term guideline for safe and effective head CT dose optimization.
MEMS-Based Bridge Modal Frequency Identification Using FFT Averaging and Konno–Ohmachi Smoothing Kholis Nurhanafi; Retno Deby Ayu Widia Ningtias; Ahmad Zarkasi; Devina Rayzy Perwitasari Sutaji Putri; Auliya Rahmatul Ummah; Sri Wigantono; Aditya Yoga Purnama
Journal of Physics and Its Applications Vol 8, No 2 (2026): May 2026
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jekk.v%vi%i.30334

Abstract

Bridge structures undergo continuous degradation due to traffic loading and environmental exposure, necessitating the development of practical methods to monitor changes in their dynamic response. This study examines the use of a low-cost MEMS accelerometer for identifying dominant modal frequency bands (natural-frequency candidates) of an operational short-span bridge under ambient excitation. An ADXL345 sensor, integrated with an Arduino-based data acquisition system and a MATLAB interface, was used to record tri-axial vibration signals at three locations on the Jembatan Jalan Gelatik in Samarinda during both daytime and late-afternoon traffic conditions. The time-domain signals were processed using Welch’s averaged windowed Fast Fourier Transform, followed by Konno–Ohmachi smoothing to clarify local spectral peaks. The analysis was intentionally limited to frequencies below 20 Hz, where global modes are expected, and the signal-to-noise ratio of the MEMS sensor is more reliable. Several consistent modal frequency bands were identified across measurement points, with dominant peaks observed between approximately 1.3–1.5 Hz, 2.1–2.7 Hz, 3.3–3.5 Hz, 5.0–6.8 Hz, 8.0–9.0 Hz, and 14–18 Hz. These peaks were validated through spatial repeatability across measurement points and temporal repeatability across different traffic conditions (daytime and late afternoon). These results indicate that the combination of low-cost sensing and noise-robust spectral processing can extract stable modal information from ambient bridge vibrations, despite the limitations of single-sensor deployment and the absence of reference-grade instruments. The findings suggest that this approach offers a feasible preliminary method for vibration-based structural assessment and may serve as a foundation for further development toward more detailed modal characterization.

Page 12 of 12 | Total Record : 112

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