Sri Oktamuliani

@unand.ac.id

Physics Department / Faculty of mathematical and Natural science
Universitas Andalas

Sri Oktamuliani


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https://researchid.co/srioktamuliani

EDUCATION

Bachelor Degree - Universitas Andalas
Master Degree - Institut Teknologi Bandung
Doctor Degree - Tohoku University
14

Scopus Publications

135

Scholar Citations

5

Scholar h-index

3

Scholar i10-index

Scopus Publications

  • Image segmentation based on active contour in chest X-ray image
    Sri Oktamuliani, Yoshifumi Saijo
    Aip Conference Proceedings, 2024
  • Characteristics of polylactic acid 3D-printed bolus for electron radiotherapy
    Annisa Yuliandari, Harmadi Harmadi, Fiqi Diyona, Muhammad Ilyas, Andra Pratama, et al.
    Aip Conference Proceedings, 2024
  • Dosimetric Characterization of 3D Printed Bolus with Polylactic Acid (PLA) in Breast Cancer External Beam Radiotherapy
    Iranian Journal of Medical Physics, 2024
  • Estimation of the excess of lifetime cancer risk in Solok Selatan
    Sri Oktamuliani, Nurul Khaira Sabila
    E3s Web of Conferences, 2023
    This study aimed to minimize radiation risk in Solok Selatan by analyzing active concentrations of 226Ra, 232Th, and 40K, calculating excess lifetime cancer risk (ELCR) from annual effective dose equivalent (AEDE). Soil samples from seven sites in the Solok Selatan, 0 – 5 cm deep, were tested with a high-purity germanium (HPGe) detector. 232Th concentrations exceeded the established global standard of 30 Bq/kg. In addition, the study included the determination of Radium Equivalent (Raeq), absorbed gamma dose rate (D), AEDE, and ELCR. Annual effective dose ranged from 68.33 to 19.92 μSv/y, below the global average of 80 μSv/y. The ELCR, the critical measure for understanding potential health risks, was 0.27 ± 0.12 x 10-3, under the global average of 0.29 x 10-3. Interestingly, areas closer to the geothermal sources, especially Koto Baru and Sungai Pagu, showed slightly higher natural radioactivity and corresponding effects. These findings emphasize the importance of rigorous surveillance and proactive measures in areas with high radioactivity characteristics. In summary, the results of this study provide important insights into the radiological landscape of Solok Selatan, urgently assisting in addressing potential health risks through informed risk assessment and strategies.
  • Image pseudo-coloring for the analysis of COVID-19 using chest X-ray images
    Sri Oktamuliani, Sri Rahayu Alfitri Usna, Dinda Nurul Syifa
    Aip Conference Proceedings, 2023
  • De-aliasing method for Doppler velocity data of echocardiography in echodynamography
    S. Oktamuliani, D. Fitriyani, R. Adrial, E. Sparzinanda, Y. Saijo
    Aip Conference Proceedings, 2021
    The de-aliasing method is developed for Doppler velocity data of echocardiography. Physiological flow velocities exceeded low and high Nyquist velocity, resulting in aliasing. Aliasing occurs when the sampled signal is less than twice the highest frequency in the signal. The system does not take enough samples to ascertain which direction the flow occurs. Therefore, the scale and direction are displayed incorrectly in echocardiography. Echodynamography, which came as an idea of the limited information obtained from color Doppler echocardiography, is a method of estimating and visualizing three-dimensional (3D) blood flow velocity vectors two-dimensional (2D) observations plane by applying flow dynamics theory to the Doppler velocity in the heart. Color Doppler echocardiography is the premiere modality to analyze blood flow in clinical practice. The de-aliasing method is applied in Echodynamography. De-aliasing extends the Nyquist velocity range to complete ambiguous estimates of blood flow direction caused by aliasing. A sufficient velocity data de- aliasing scheme must be applied to recover the actual signal from the raw measurement. The method is tested with color Doppler echocardiography. The results show that the analytical study demonstrated that the de-aliasing method could efficiently and effectively reconstruct color Doppler velocity at the blood data point. Future discussion of the method limitations and possible improvements are needed.
  • Validation of Echodynamography in Comparison with Particle-image Velocimetry
    Sri Oktamuliani, Naoya Kanno, Moe Maeda, Kaoru Hasegawa, Yoshifumi Saijo
    Ultrasonic Imaging, 2019
    Echodynamography (EDG) is a computational method to estimate and visualize two-dimensional flow velocity vectors by applying dynamic flow theories to color Doppler echocardiography. The EDG method must be validated if applied to human cardiac flow function. However, a few studies of flow estimated have compared by EDG to the flow data were acquired by other methods. In this study, EDG was validated by comparing the analysis of estimating and visualizing flow velocity vectors obtained by original particle image velocimetry (PIV) based on a left ventricular (LV) phantom hydrogel (in vitro studies) and by EDG based on the virtual Doppler velocity. Velocity measured by PIV method and velocity estimated by EDG method in the perpendicular direction and the radial direction were compared. Regression analysis for the velocity estimated in the radial direction revealed an excellent correlation ([Formula: see text], slope = 0.96) and moderate correlation in the perpendicular direction ([Formula: see text], slope = 0.46). As revealed by the Bland–Altman plot, however, overestimations and higher relative error were observed in the perpendicular direction (0.51 ± 2.75 mm/s) and in the radial direction (–2.15 ± 21.13 mm/s). The percentage error of the norm-wise relative error of the velocity discrepancy is less than [Formula: see text], and velocity magnitude followed the same trends and are of comparable magnitude. These findings indicate that good estimates of velocity can be obtained by the EDG method. Therefore, the EDG method was appropriate for estimating and visualizing velocity vectors in clinical studies for higher measurement accuracy and reliability. The clinical in vivo application showed that the EDG method has the ability to visualize blood flow velocity vectors and differentiate the clinical information of vortex parameters both in normal and abnormal LV subjects. In conclusion, the EDG method has potentially greater clinical acceptance as a tool assessment of LV during the cardiac cycle.
  • Left Ventricular Vortices in Myocardial Infarction Observed with Echodynamography
    Sri Oktamuliani, Kaoru Hasegawa, Yoshifumi Saijo
    Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society EMBS, 2019
    Echodynamography (EDG) is a computational method to deduce two-dimensional (2D) blood flow vector from conventional color Doppler ultrasound image by considering that the blood flow is divided into vortex and base flow components. Left ventricular (LV) vortices indicate cardiac flow status influenced by LV wall motion. Thus, quantitative assessment of LV vortices may become new and sensitive parameters for cardiac function. In the present study, quantitative parameters of LV vortices such as vortex index, vortex size, and Reynolds number were calculated and relation between each parameter was assessed. Six healthy volunteers and three patients with myocardial infarction (MI) who underwent color Doppler echocardiography (CDE) were involved in the study. Serial CDE images in apical three-chamber view were recorded and 2D blood flow vector was superimposed on the CDE image. Vortex index, vortex size, and Reynolds number were compared between the normal volunteers and the MI patients. The results showed that vortex index (3.09±2.06 vs. 3.34±2.33, p<0.05), vortex size (1.76 0.69 vs. 2.01 ±0.68, p<0.05), Reynolds number (1020±603 vs.±1312 1046, p<±0.05) were significantly greater in the MI patients than in the healthy volunteers. Vortex equivalent diameter in LV showed significant positive correlation with Reynolds number (R2 = 0.799, y = 0.001x + 0.7098, p < 0.05) in healthy volunteers and (R2 = 0.6404, y = 0.0005x+1.3185, p<0.05) in MI patients. Vortex index showed positive correlation with Reynolds number (R2 = 0.9351, y = 0.002x+0.1397, p<0.05) in healthy volunteers and (R2 = 0.758, y = 0.0019x+0.7957, p<0.05) in MI patients. In conclusion, EDG provides information on LV hemodynamics by quantitative LV vortices parameters both in healthy volunteers and MI patients.
  • Left Ventricular Blood Flow Dynamics in Aortic Stenosis before and after Aortic Valve Replacement
    Tadanori Minagawa, Yoshifumi Saijo, Sri Oktamuliani, Takafumi Kurokawa, Hiroyuki Nakajima, et al.
    Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society EMBS, 2018
    Surgical intervention for aortic valve stenosis (AS) has been established; however its diagnosis based on echocardiographic assessment is still limited by aortic valvular velocity, aortic valvular pressure gradients, and color Doppler imaging. Echo-dynamography (EDG) is a method to determine intracardiac flow dynamics, such as two-dimensional blood flow velocity, vortex, and dynamic pressure. These flow dynamics may be influenced by left ventricular (LV) wall motion and the resistance in LV outflow caused by AS. The objective of the present study was to assess the changes and differences in LV vortices and vorticity before and after AS surgery. Five patients who underwent aortic valve replacement surgery for AS and five control patients were included. Besides routine echocardiographic measurement, EDG was applied to determine the two-dimensional blood flow vector and vorticity. The LV vortex flow in the isovolumetric contraction phase had multiple formations in preoperative cases. The clockwise vortex was found in all cases postoperatively; the vortex formation showed no significant difference between postoperative and normal control groups. EDG may serve important information on LV flow dynamics, non-invasively.
  • Correction of aliasing in color Doppler echocardiography based on image processing technique in echodynamography
    Sri Oktamuliani, Kaoru Hasegawa, Yoshifumi Saijo
    ACM International Conference Proceeding Series, 2018
    A study about the program of color Doppler to improve blood velocity estimation has been developed. Color Doppler echocardiographic images were acquired using Philips IE33 have a crucial issue the ambiguity of the offset beams when the correct velocity of the blood flow exceeds the velocity of the Nyquist limit. Therefore, velocity dealiasing is needed in quality control of color Doppler echocardiographic data to correct velocities using EDG (echodynamography) based on observer and machine interaction. The program is applied to echocardiography images of aortic stenosis subject as a technique to assess cardiovascular function. One challenging with color Doppler is correcting velocity aliasing. The observer determines the ambiguity area based on his or her knowledge. These results confirm the dealiasing and noise removing are vital elements in improving blood velocity estimation in cardiovascular diagnostic. Therefore, this study could use clinical tools based on color Doppler imaging.
  • A theoretical model of laser heating carbon nanotubes
    Syahril Siregar, Sri Oktamuliani, Yoshifumi Saijo
    Nanomaterials, 2018
  • Blood Flow Patterns in the Left Ventricle by Echodynamography Method
    Sri Oktamuliani, Kaoru Hasegawa, Yoshifumi Saijo
    2018 International Conference on Orange Technologies Icot 2018, 2018
  • Evaluation of blood flow dynamics in healthy and myocardial infarction hearts using Echodynamography
    Sri Oktamuliani, Yoshifumi Saijo, Kaoru Hasegawa
    Proceedings of Meetings on Acoustics, 2017
  • Design study of lead bismuth cooled fast reactors and capability of natural circulation
    Sri Oktamuliani, Zaki Su’ud
    Aip Conference Proceedings, 2015

RECENT SCHOLAR PUBLICATIONS

  • ANALISIS KOMPARATIF VISION TRANSFORMER (VIT) DAN RESNET34 UNTUK KLASIFIKASI DIFERENSIAL SUBTIPE KANKER PARU-PARU BERBASIS CITRA CT SCAN
    RC Syuherman, N Aldira, F Dilla, R AG, S Qalbi, V Zahira, S Oktamuliani
    JOURNAL ONLINE OF PHYSICS 11 (2), 132-140 , 2026
    2026
  • Potential Radiological Hazard of Coal-Fired Power Plant
    S Oktamuliani, PT Caredek, M Wiyono, W Wahyudi, K Kusdiana
    Jurnal Ilmiah Pendidikan Fisika Al-Biruni 14 (1), 145-154 , 2025
    2025
    Citations: 1
  • Penerapan algoritma deep learning YOLOv8 pada platform Roboflow untuk segmentasi citra panoramik
    L Mahdiyah, S Oktamuliani, WL Putri
    Jurnal Fisika Unand 14 (3), 228-234 , 2025
    2025
    Citations: 4
  • Optimizing Doppler Ultrasound Parameters: The Study of Insonation Angle, PRF, and Dynamic Range in Blood Flow Assessment
    S Oktamuliani, T Ishii, Y Saijo
    JURNAL ILMU FISIKA| UNIVERSITAS ANDALAS 17 (1), 53-62 , 2025
    2025
  • Pengelolaan Laboratorium di SMAN 2 Sipora Kepulauan Mentawai
    D Mardiansyah, A Mahyudin, W Wildian, D Dahlan, MA Shafii, Z Zulfi, ...
    Jurnal Pengabdian kepada Masyarakat Nusantara 6 (1), 354-360 , 2025
    2025
  • Analysis of Radiographic Image Quality in Computed Radiography with Variations in Subject Thickness and AEC Sensitivity Settings
    TNA Yenuuar, S Oktamuliani
    Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 15 (1) , 2025
    2025
  • Peningkatan Akurasi Interpretasi Aliran Darah pada Citra Color Doppler Echocardiography (CDE) dengan Metode De-Aliasing
    S Yohanda, S Oktamuliani
    Jurnal Fisika Unand 14 (6), 644-652 , 2025
    2025
  • Peningkatan Kualitas Citra Radiograf Panoramik Menggunakan Metode Filter Laplacian
    H Haq, S Oktamuliani, WL Putri, G Gunawan, S Adnan
    Jurnal Fisika Unand 13 (5), 624-629 , 2024
    2024
    Citations: 1
  • Education of Disaster Awareness through Disaster Readiness Socialization as an Effort to Increase Community Knowledge around the Nobita Hill Tourism Area on Disaster Mitigation
    M Marzuki, M Vonnisa, H Harmadi, D Pujiastuti, A Budiman, D Puryanti, ...
    Warta Pengabdian Andalas 31 (2), 353-361 , 2024
    2024
    Citations: 1
  • Image segmentation based on active contour in chest X-ray image
    S Oktamuliani, Y Saijo
    AIP Conference Proceedings 3074 (1), 020003 , 2024
    2024
  • Characteristics of polylactic acid 3D-printed bolus for electron radiotherapy
    A Yuliandari, H Harmadi, F Diyona, M Ilyas, A Pratama, S Oktamuliani
    AIP Conference Proceedings 2891 (1), 090013 , 2024
    2024
    Citations: 2
  • Dosimetric Characterization of 3D Printed Bolus with Polylactic Acid (PLA) in Breast Cancer External Beam Radiotherapy.
    A Yuliandari, S Oktamuliani, F Diyona
    Iranian Journal of Medical Physics/Majallah-I Fīzīk-I Pizishkī-i Īrān 21 (3) , 2024
    2024
    Citations: 3
  • Peningkatan Pembelajaran Fisika di SMAN 2 Gunung Talang Kabupaten Solok Melalui Kegiatan Pengabdian Masyarakat.
    D Mardiansyah, W Wildian, A Muttaqin, M Muldarisnur, R Fardela, A Afdal, ...
    BERNAS: Jurnal Pengabdian Kepada Masyarakat 5 (1), 493-500 , 2024
    2024
    Citations: 7
  • Pengabdian Untuk Meningkatkan Keterampilan Menyelesaikan Masalah Kinematika Pada Siswa Di Sma N 1 Gunung Talang
    R Fardela, R Adrial, D Mardiansyah, A Muttaqin, D Milvita, SRA Usna, ...
    Jurdimas (Jurnal Pengabdian Kepada Masyarakat) Royal 7 (1), 34-41 , 2024
    2024
  • Estimasi Faktor Transfer Radionuklida Alam Tanah ke Beras dan Dosis Internal Tahunan Pada Penduduk di Sekitar Geotermal Solok Selatan
    A Nabilah, S Oktamuliani, L Nirwani
    Jurnal Fisika Unand 13 (1), 96-102 , 2024
    2024
    Citations: 1
  • Efektivitas Perubahan Fase Material KCl/H2O sebagai Sistem Pendingin Ikan Laut
    I Alief, SRA Usna, A Astuti, S Oktamuliani
    Jurnal Fisika Unand 13 (1), 8-14 , 2024
    2024
    Citations: 4
  • The Accuracy of TIAC Calculated Using SPECT/CT Imaging Data at 36-and 100-Hours Post Injection and Prior Information in 177Lu-DOTATATE
    RM Siyami, S Oktamuliani, MD Naqiyyun, IAS Mu'minah
    JURNAL ILMU FISIKA| UNIVERSITAS ANDALAS 16 (1), 55-62 , 2024
    2024
  • Pabrikasi Bolus 3D berbahan Polylactic Acid untuk Terapi Radiasi pada Pasien Kanker Payudara
    A Yuliandari, S Oktamuliani, A Pratama
    JST (Jurnal Sains dan Teknologi) 12 (2), 524-532 , 2023
    2023
    Citations: 1
  • Pengaruh Tegangan terhadap Nilai CTDIvol, Dose Length Product dan Dosis Efektif pada Pemeriksaan Computed Tomography (CT) Abdomen: Studi di Rumah Sakit Umum Pusat Dr. M. Djamil
    F Fiarka, S Oktamuliani, N Nuraeni
    Jurnal Fisika Unand 12 (4), 591-597 , 2023
    2023
    Citations: 2
  • RADIOAKTIVITAS ALAM PADA SAMPEL AIR SUNGAI, AIR SUMUR DAN AIR MINUM DI SEPANJANG SUNGAI BATANG HARI, JAMBI
    FA An'umillah, S Oktamuliani, K Kusdiana
    JOURNAL ONLINE OF PHYSICS 8 (3), 93-98 , 2023
    2023

MOST CITED SCHOLAR PUBLICATIONS

  • Identifikasi Mineral Pada Batuan Granit Di Geopark Merangin Provinsi Jambi Menggunakan X-Ray Diffraction (XRD) Dan Scanning Electron Microscopy
    S Oktamuliani, S Samsidar, N Nehru
    Journal Online of Physics 1 (1), 12-17 , 2015
    2015
    Citations: 26
  • A theoretical model of laser heating carbon nanotubes
    S Siregar, S Oktamuliani, Y Saijo
    Nanomaterials 8 (8), 580 , 2018
    2018
    Citations: 20
  • Validation of echodynamography in comparison with particle-image velocimetry
    S Oktamuliani, N Kanno, M Maeda, K Hasegawa, Y Saijo
    Ultrasonic Imaging 41 (6), 336-352 , 2019
    2019
    Citations: 13
  • Peningkatan Pembelajaran Fisika di SMAN 2 Gunung Talang Kabupaten Solok Melalui Kegiatan Pengabdian Masyarakat.
    D Mardiansyah, W Wildian, A Muttaqin, M Muldarisnur, R Fardela, A Afdal, ...
    BERNAS: Jurnal Pengabdian Kepada Masyarakat 5 (1), 493-500 , 2024
    2024
    Citations: 7
  • Comparison of Absorbed Dose in Plasticine Bolus and Silicone Rubber Bolus
    LC Leony, VF Hanif, E Defira, SO Oktamuliani, A Muttaqin, M Ilyas
    Journal of Physics: Theories and Applications 6 (1), 25-33 , 2022
    2022
    Citations: 6
  • Correction of aliasing in color doppler echocardiography based on image processing technique in echodynamography
    S Oktamuliani, K Hasegawa, Y Saijo
    Proceedings of the 3rd international conference on biomedical signal and … , 2018
    2018
    Citations: 5
  • Left ventricular blood flow dynamics in aortic stenosis before and after aortic valve replacement
    T Minagawa, Y Saijo, S Oktamuliani, T Kurokawa, H Nakajima, ...
    2018 40th Annual International Conference of the IEEE Engineering in … , 2018
    2018
    Citations: 5
  • Evaluation of blood flow dynamics in healthy and myocardial infarction hearts using echodynamography
    S Oktamuliani, Y Saijo, K Hasegawa
    Proceedings of Meetings on Acoustics 32 (1), 020007 , 2017
    2017
    Citations: 5
  • Penerapan algoritma deep learning YOLOv8 pada platform Roboflow untuk segmentasi citra panoramik
    L Mahdiyah, S Oktamuliani, WL Putri
    Jurnal Fisika Unand 14 (3), 228-234 , 2025
    2025
    Citations: 4
  • Efektivitas Perubahan Fase Material KCl/H2O sebagai Sistem Pendingin Ikan Laut
    I Alief, SRA Usna, A Astuti, S Oktamuliani
    Jurnal Fisika Unand 13 (1), 8-14 , 2024
    2024
    Citations: 4
  • Optimalisasi Pemanfaatan Media Online Phet Simulation Untuk Upaya Peningkatkan Pemahaman Konsep Fisika di SMA N 2 Harau
    R Fardela, D Mardiansyah, M Yusfi, E Liza Namigo, M Vonnisa, I Taufiq, ...
    Indonesian Journal of Community Empowerment and Service 2 (2) , 2022
    2022
    Citations: 4
  • Dosimetric Characterization of 3D Printed Bolus with Polylactic Acid (PLA) in Breast Cancer External Beam Radiotherapy.
    A Yuliandari, S Oktamuliani, F Diyona
    Iranian Journal of Medical Physics/Majallah-I Fīzīk-I Pizishkī-i Īrān 21 (3) , 2024
    2024
    Citations: 3
  • Pengolahan Filtering dan Contrast Enhancement untuk Meningkatkan Kualitas Resolusi Citra Ultrasonografi Abdomen
    A Firma, S Oktamuliani
    JOURNAL ONLINE OF PHYSICS 8 (1), 51-54 , 2022
    2022
    Citations: 3
  • Simulasi PhET sebagai laboratorium virtual dalam peningkatan pemahaman konsep fisika siswa SMAN 3 Painan, Pesisir Selatan
    S Oktamuliani, B Centaury, S Muhaimin, A Afdal, R Adrial, M Muldarisnur, ...
    Warta Pengabdian Andalas 28 (4), 509-513 , 2021
    2021
    Citations: 3
  • Blood Flow Patterns in The Left Ventricle by Echodynamography Method
    S Oktamuliani, K Hasegawa, Y Saijo
    2018 International Conference on Orange Technologies (ICOT), 1-3 , 2018
    2018
    Citations: 3
  • Characteristics of polylactic acid 3D-printed bolus for electron radiotherapy
    A Yuliandari, H Harmadi, F Diyona, M Ilyas, A Pratama, S Oktamuliani
    AIP Conference Proceedings 2891 (1), 090013 , 2024
    2024
    Citations: 2
  • Pengaruh Tegangan terhadap Nilai CTDIvol, Dose Length Product dan Dosis Efektif pada Pemeriksaan Computed Tomography (CT) Abdomen: Studi di Rumah Sakit Umum Pusat Dr. M. Djamil
    F Fiarka, S Oktamuliani, N Nuraeni
    Jurnal Fisika Unand 12 (4), 591-597 , 2023
    2023
    Citations: 2
  • Analisis Kandungan Radionuklida Alam Pada Fly Ash, Bottom Ash, dan Tanah dari PLTU di Industri Gula dengan Menggunakan Spektrometer Gamma
    PT Caredek, M Wiyono, W Wahyudi, K Kusdiana, S Oktamuliani
    Jurnal Fisika Unand 12 (3), 424-430 , 2023
    2023
    Citations: 2
  • Analisis Pengaruh Filter Terhadap Kualitas Citra Berbasis Resolusi Spasial Dan Derau Pada Pesawat Fluoroskopi C-Arm
    DN Syifa, S Oktamuliani
    Jurnal Fisika Unand 12 (2), 249-254 , 2023
    2023
    Citations: 2
  • Determination of Natural Radioactivity Level on Soil and Radiological Hazards in The Geotermal Area of Solok South, West Sumatera
    NK Sabila, DN Syifa, MR Alhafiz, S Oktamuliani
    Journal of Physics: Theories and Applications 5 (2), 81 , 2021
    2021
    Citations: 2