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Optimizing Treatment Planning: Enhancing Precision in Radiotherapy Treatment through the Estimation of Hounsfield Unit Values from CT-Scan Data Calculation Novan, Novan; Priyanti, Novie Ary
Jurnal Fisika Vol. 14 No. 1 (2024): Jurnal Fisika 14 (1) 2024
Publisher : Universitas Negeri Semarang

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This study aims to increase precision in radiotherapy treatment planning by optimizing the estimated Hounsfield Unit (HU) value through calculating CT-scan data as a template. Radiotherapy is a therapy commonly used in the health sector to treat abnormal and uncontrolled growth of organism cells, such as lung cancer, brain tumors, leukemia and bone tumors. Radiotherapy utilizes gamma rays to eliminate abnormal cells through copying, taking into account appropriate radiation dose limits to minimize damage to normal tissue during the copying process. The level of absorption or radiodensity of a network can be expressed in Hounsfield Unit (HU) values. This simulation application design is supported by computer equipment with Intel i3 2 GHz processor specifications supported by 2 GB RAM (Random Access Memory), VGA (Video Graphics Adapter) 1 GB and 160GB hard disk. The device is used to determine the attenuation value (radiation absorption coefficient for each tissue) using the air attenuation value as a reference. The data processing method uses Green Foot software based on the multiplatform Java programming language. The program input is a CT-scan image with Grayscale analysis, and the output is Hounsfield values. The results of this study show that the use of CT-scan data and Hounsfield Unit (HU) calculations can increase the accuracy of radiotherapy planning. Using this technology, the radiation dose can be adjusted more effectively to the targeted area, while still minimizing the impact on surrounding healthy tissue. The integration of CT-scan and HU calculation in this study provides a strong basis for further development, with a focus on improving the precision and efficiency of radiotherapy.

A Critical Examination on the Lorentz Contraction of a Rod Hermanto, Arief; Hanang Setya Budhi, Romy
Jurnal Fisika Vol. 14 No. 1 (2024): Jurnal Fisika 14 (1) 2024
Publisher : Universitas Negeri Semarang

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When studying special relativity, we usually find Lorentz contraction as one of the most clear andstraightforward consequences of the Lorentz Transformation. The derivation of Lorentz contractionfrom Lorentz Transformation is apparently so simple that we usually overlook an important idealassumption. A body which is Lorentz contracted is assumed to exist in infinite time in its rest frameof reference. In this paper we will derive Lorentz contraction without that assumption. We willderive Lorentz contraction (using spacetime diagram) of a rod with finite lifetime in its rest frame ofreference. The result is such that the famous Lorentz contraction formula is only valid in certaincondition concerning the lifetime of the rod.

Comparison of the Uptake Percentage of Technetium-99m Pertechnetate in Hyperthyroid Patients during Gamma Scintigraphy Examination Soetanto, Wilson; Riupassa, Robi Dany
Jurnal Fisika Vol. 14 No. 1 (2024): Jurnal Fisika 14 (1) 2024
Publisher : Universitas Negeri Semarang

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Gamma scintigraphy is an examination that can be used to evaluate patients suspected of suffering from hyperthyroidism. This procedure involves administering the radiopharmaceutical Technetium-99m to the patient, followed by imaging using a gamma camera to check the function of the thyroid gland. The resulting image can be analysed using the ROI (Region of Interest) method to measure the percentage of radiopharmaceutical uptake by the thyroid. The aim of this study was to compare the uptake of radiopharmaceuticals in hyperthyroid patients and determine the correlation between uptake values and age and gender factors. This study involved 47 hyperthyroid patients, including 15 men and 32 women, aged between 10 and 75 years. The results showed that the average level of absorption (uptake) of radiopharmaceuticals by the right lobe of the thyroid (7.49% ± 7.41%) was higher than that by the left lobe (6.58% ± 6.31%). Additionally, men showed a higher uptake percentage (17.55% ± 14.34%) compared to women (12.44% ± 12.86%). Another finding was that there was a significant (strong) negative correlation between the uptake value and the patient's age, both in men (r = -0.641, p = 0.00988) and women (r = -0.674, p = 0.00010).

Biological Half-Life of Technetium-99m Ethambutol in Tuberculosis Patients: A Whole-Body Scan Perspective Sinaga, Morgan Hanny Griselda; Harade, Ryo Rachman; Manik, Josua Timotius
Jurnal Fisika Vol. 14 No. 1 (2024): Jurnal Fisika 14 (1) 2024
Publisher : Universitas Negeri Semarang

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The development of an etambutol radiopharmaceutical kit by PTNBR Batan aims to enhance the specificity of Mycobacterium Tuberculosis (MTb) imaging, the causative agent of tuberculosis. This research evaluates the distribution and biological half-life of Technetium-99m Etambutol radiopharmaceutical in the lungs, right kidney, left kidney, and bladder. This information is crucial for understanding the radiopharmaceutical's distribution within the body and improving the interpretation of whole-body etambutol scan results. The region of interest (ROI) technique was employed to delineate the areas of interest in the anterior and posterior images. The study sample consisted of 12 patients suspected of TB, with 5 females and 7 males aged 24 to 75 years. The results demonstrated that technetium-99m etambutol was distributed throughout the body with primary excretion routes through urine and feces. The highest activity was observed in the lungs, indicating the presence of tuberculosis infection. The longest biological half-life of technetium-99m etambutol was recorded in the left kidney (5.74 ± 1.42 hours) with a decay constant of 0.242 hour-1 and the right kidney (5.10 ± 1.89 hours) with a decay constant of 0.269 hour-1.

Seismic Vulnerability Microzonation Using Hvsr Method in Kalisalak Hamlet, Garunglor Village, Sukoharjo Sub-District, Wonosobo District Ardiansyah, Adam; Adhi, Aryono; Wibowo, Nugroho Budi; SARWI; Budi Astuti; Cindiwati
Jurnal Fisika Vol. 14 No. 2 (2024): Jurnal Fisika 14 (2) 2024
Publisher : Universitas Negeri Semarang

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Kalisalak Hamlet in Sukoharjo District is faced with the risk of landslides that can affect the structure of residents' houses. This study aims to identify potential landslide zones based on the parameters of Dominant Frequency (f_0), Amplification Factor (A_0), and Seismic Vulnerability (K_g)to determine areas that are potentially vulnerable to landslides. Microseismic measurements were carried out at 25 measurement points in the landslide zone. Measurements used a 3-component digital portable seismograph (North-South, West-East, and Vertical). Microseismic data were processed using Geopsy software with the HVSR (Horizontal-to-Vertical Spectral Ratio) method to obtain an H/V curve that provides Dominant Frequency (f_0) and Amplification Factor (A_0) values. The results showed that Kalisalak Village has a dominant frequency value between 3 Hz to 12.5 Hz and an amplification factor value between 1.4 to 6.8. This variation indicates that some areas are more susceptible to seismic vibration amplification. Based on the Dominant Frequency (f_0) value and Amplification Factor (A_0), a Seismic Vulnerability (K_g) microzonation map was created for Kalisalak hamlet with a value range of 0.2 to 7 with a high vulnerability value located in the landslide area south of the village. This map is important for disaster mitigation planning in Kalisalak hamlet.

Triplane Framework: Redefining Space-time Visualization in Special Relativity Ghosh, Arnub
Jurnal Fisika Vol. 15 No. 1 (2025): Jurnal Fisika 15 (1) 2025
Publisher : Universitas Negeri Semarang

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This research delves into the spatial distribution of speed limits and space-time intervals across various axes within three-dimensional and four-dimensional space-time. A novel theoretical model is proposed based on this distribution, aimed at enhancing the visualization and comprehension of four-dimensional space-time. The primary objective of this study is to offer an intuitive approach to visualizing the spacetime continuum and to present an innovative framework for interpreting four-dimensional space-time. Our investigation revealed that speed limits along different spatial axes may not universally adhere to the speed limit constant, c. Furthermore, we uncovered that the invariant space-time interval can be dissected along these axes, leading to the development of the Triplane Framework. This framework interprets spacetime as three intersecting orthogonal planes rather than four dimensions. Additionally, the study explores the mathematical formalism governing component transformations within this Triplane framework. This research contributes fundamental insights into special relativity by elucidating the distribution of speed limits and space-time intervals within three and four-dimensional space-time. Such insights enrich the interpretation of experimental data in fields like astrophysics and cosmology. Moreover, the proposed Triplane Space-time Framework offers a fresh perspective for visualizing relativistic phenomena, potentially influencing theoretical frameworks in the field.

Identification of Hydrothermal Reservoirs Using the Dipole-Dipole Configuration Geoelectric Method in Air Putih Village, Lebong Regency, Bengkulu wahyu, Wahyu cahyadi setiawan; Suhendra, Suhendra; Halauddin, Halauddin; Muhammad Wilzam Fauzi, Muhammad Wilzam Fauzi; Bayu Saputra, Bayu Saputra; Sri Rahayu, Sri Rahayu; Rival Zamrawi, Rival Zamrawi; Bimantara Panca Utama, Bimantara Panca Utama
Jurnal Fisika Vol. 14 No. 1 (2024): Jurnal Fisika 14 (1) 2024
Publisher : Universitas Negeri Semarang

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This study was conducted in Lebong Regency, Bengkulu Province, where the Ketahun segmented fault crosses. Using geoelectric data, this study was conducted to identify the distribution of hydrothermal reservoirs, the dipole-dipole method was used because it obtained more data so as to see the potential distribution of hot water and subsurface constituent rocks in more detail, obtained the results of analysis from processing using RES2DINV that the resistivity value is 6.66 -23.5 Ωm which is thought to be a geothermal source, the rock formation that is considered to be related to the hot springs of Air Putih Village is located at (72.4 - 120) metres with a depth of (0.5 -18) metres. The rock layer has a resistivity value of (6.6 - 23.5 Ωm), which is characteristic of hot water because it has low resistance and is perpendicular to the hot spring. The existence of this weak zone indicates that the porosity will increase, causing hot water from the subsurface to appear as a geothermal manifestation, the hydrothermal distribution in the research area is uneven due to the unequal rock constituents, according to the geological map in the research area the area is a sihapas formation, where the sihapas formation consists of sedimentary rocks, sand, clastic, and siltstone. This research is recommended to develop the tourism potential of hot springs in Air Putih Village, Lebong.

Magnetic Anomaly Model Interpretation of Geothermal Area in Air Putih Region, Lebong District, Bengkulu Province Gea, Jessica Agnes Soroinama; Refrizon; Halauddin; Purwanto, Eko Heru; Sari, Widya Kurnia; Rizki, Juni Putri
Jurnal Fisika Vol. 14 No. 2 (2024): Jurnal Fisika 14 (2) 2024
Publisher : Universitas Negeri Semarang

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Lebong Regency is located in the Sumatra Fault Zone, a relatively long dextral shear fault, causing unique structural and morphological changes around the fault zone. The Air Putih area, Lebong Regency, has geothermal manifestations in the form of hot springs that gush and flow from river banks and cliffs. In determining the subsurface structure model, magnetic anomalies were interpreted from direct measurements using two sets of Proton Precession Magnetometers (PPM) as the base and rover. The magnetic method was used to identify the subsurface structures displayed in a 2D model. The results of magnetic anomaly mapping in the study area show that 2D modelling can provide an overview of objects or rocks that cause anomalies at the study site. Based on subsurface modeling at the research site, four incisions were made, namely incisions A-A’ with a susceptibility contrast value of 0.516042 SI with hematite mineral type; in incisions B-B', it is suspected that is a mineral, namely gneiss with a susceptibility value of 0.164160 SI; incision C-C' has a susceptibility value of 0.172010 SI with gneiss rock type; and incision D-D' has a susceptibility value of 0.060604 SI, which is suspected to be a pyrite mineral. The rock types in the study area are mainly thought to be gneiss igneous rocks and the magnetic minerals quartz, pyrite, and calcite, which have different susceptibility values.

SEISMIC VULNERABILITY INDEX MICROZONATION IN MUARA AMAN CITY BASED ON HVSR METHOD Wijaya Kusuma, Repal; Setyowati, Yuni; Refrizon; Farid, M Farid; Al Ansory, Andre Rahmat; Raihana, Hana; Nurul ‘Ilmi Rahmawati; Olga Triutami
Jurnal Fisika Vol. 14 No. 2 (2024): Jurnal Fisika 14 (2) 2024
Publisher : Universitas Negeri Semarang

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Muara Aman City has a high frequency of earthquakes. The research aims to map earthquake-prone areas using indicators such as natural/dominant frequency value parameter (f0), amplification factor (A0), and seismic vulnerability index (Kg). Measurements in this study were conducted using a PASI Mod Gemini 2 Sn-1405 seismometer for 30 minutes at 21 measurement points. The data processing results include natural frequency: 0.15-8.59 Hz, amplification factor: 0.97-6.009, and seismic vulnerability index: 0.2-56.3 After obtaining the values of these parameters, a distribution map is created by pairing each parameter value with the coordinates of the research point. Based on the values of these parameters, areas with high seismic vulnerability are found in zones T3, T4, T5, T6, T15, and T16. The research findings can offer valuable insights for both the community and government in implementing strategies to minimize the impact of earthquake damage and losses.

Virtual Tide Gauge Observation of the 2006 Pangandaran Tsunami Using COMCOT Version 1.7 Farikha Qurotun Uyun; Supriyadi; Sutikno; Mochamad Aryono Adhi; Hamzah Latief
Jurnal Fisika Vol. 14 No. 2 (2024): Jurnal Fisika 14 (2) 2024
Publisher : Universitas Negeri Semarang

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The 2006 Pangandaran tsunami was one of the most significant natural disasters in Indonesia, causing major damage to coastal infrastructure and extensive social impacts. This study aims to reconstruct the 2006 Pangandaran tsunami using topographic data from DEMNAS and bathymetry data from BATNAS by applying it to a fine grid size (nested model). The other purpose is to determine the validity of the model that has been made if verified using a comparison with the results of field surveys and calculations of Aida numbers. The research method used is by using topographic data from DEMNAS and bathymetry data from BATNAS as well as using earthquake mechanism data from Global CMT. Furthermore, it is simulated using COMCOT software version 1.7 as well as by creating a nested grid of 4 grids. The obtained simulation results are then verified using field data and Aida numbers. The results of this study show that the earthquake with a magnitude of 7.7 Mw caused the movement of tectonic plates which resulted in a decrease and increase in sea level along the coast of Pangandaran. The simulation results have an Aida K value of 1.48 and an Aida

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Editorial Address Sekaran, Kec. Gn. Pati, Kota Semarang, Jawa Tengah 50229

Location Kota semarang, Jawa tengah INDONESIA

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Contact Name
-

Contact Email
jurnalfisika@mail.unnes.ac.id

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Journal Mail Official
jurnalfisika@mail.unnes.ac.id

Editorial Address
Sekaran, Kec. Gn. Pati, Kota Semarang, Jawa Tengah 50229

Location
Kota semarang,

Jawa tengah

INDONESIA