Wahyu Setia Budi

• Diponegoro University

Key exposure factors, such as tube voltage are critical in CT examinations as they will impact the quality of the images produced by the CT scan. Spatial resolution is one of the parameters that can be used to determine image quality. The purpose of this study is to evaluate the impact of tube voltage in spatial resolution in three axes (x, y, z) u...

The accurate planning and selection of applicators are crucial in brachytherapy treatment to deliver radiation doses with high precision, ensuring maximum tumor targeting while minimizing doses to surrounding healthy organs. This study aims to evaluate the influence of changes in intrauterine applicator depth on the distribution of radiation doses...

Heavy metals can be found in everyday environments and can enter the human body through food, water, and air. Heavy metals are categorized into three groups by the World Health Organization (WHO): essential elements such as Copper (Cu), Chromium (Cr), Cobalt (Co), Iron (Fe), and Zinc (Zn); potentially essential elements like Manganese (Mn) and Nick...

Lung-to-bone cancer metastasis frequently involves bone lesions, particularly in the vertebrae. A bone scan using the radiopharmaceutical 99mTc MDP is a common diagnostic tool for detecting advanced metastases. This research aimed to determine the conversion factor of count rate to unit activity, assess the range of source activity in bones with an...

Cervical cancer which attacks the cervix is triggered by a virus called human papilloma virus (HPV). One effective treatment method for cervical cancer is external radiotherapy using a Linear Accelerator (Linac). This research aims to obtain radiation dose distribution by comparing the effectiveness of two treatment techniques cervical cancer, thro...

Stainless steel is a notably beneficial product and is widely used in many applications. Controlling the quality of steel products by determining their trace elemental content is essential. The content of trace elements such as Cr in steel protects the alloy from corrosion and enhances its lifetime, especially in the case of steel embedded in concr...

The quality control (QC) procedure of computed tomography (CT) is an important task to be regularly performed. It consists of daily, monthly, and annual tasks. Each procedure can be time-consuming. Manual QC can take many hours. Manual measurement of image quality parameters can also lead to a bias due to the subjectivity of examiners. IndoQCT answ...

It is indispensable to accurately and sensitively identify and analyze the elemental composition of human blood serum. In the current study, human blood serums were analyzed for elements utilizing orthogonal dual pulse laser-induced breakdown spectroscopy (DP-LIBS) setup in He gas environment. Experimentally, a fundamental pulse Nd:YAG laser (1064...

Glioblastoma multiforme merupakan kanker otak stadium IV yang sangat sulit diobati dan umumnya terjadi pada hemisfer serebrum otak. Terapi BNCT telah dikembangkan untuk pengobatan glioblastoma yang lebih aman, namun hamburan neutron dan foton gamma yang berasal dari terapi pada organ at risk ini perlu dievaluasi menggunakan simulasi. Metode yang di...

A method to calculate a corrected effective diameter (DMIL) to more accurately estimate the dose received by a patient in chest computed tomography (CT) examination had been previously proposed. However, the discrepancy between DMIL and water-equivalent diameter (Dw) is still relatively high (i.e. about 6%). Furthermore, the method is still perform...

Estimation of radiation dose in the gallbladder and pancreas for examination using computed tomography on the basis of size-specific dose estimate (SSDE) Abstract. In computed tomography (CT), the images of many slices are sometimes displayed unorderly. In addition, multiple series are also sometimes performed in one study and images are unorderly...

Background: Proton therapy is an innovative and highly advanced external radiation therapy modality for cancer treatment that uses positively charged atomic particles. The usage of proton therapy facilities in Asia has been increasing and will be followed by Indonesia in the short-coming years. In line with its significant benefits, the application...

In the metal sector, the trace elemental analysis of stainless steel is required to regulate product quality. In this work, such analysis was carried out using laser-induced breakdown spectroscopy (LIBS) with a picosecond Nd:YAG laser in a He gas environment and ambient air. The results confirm the enhancement in LIBS emission signals in He gas com...

High-purity metal nanoparticles such as gold and silver nanoparticles become an interesting subject for application in the medical field. Using the laser ablation approach, these nanoparticles were successfully synthesized in this present work. Experimentally, a pulse neodymium yttrium aluminum garnet laser (1064 nm, 30 mJ, 10 Hz) was used to irrad...

The main feature of the IndoQCT software is to evaluate CT image quality. In the CT quality control (QC) procedure, generally qualified examiners or medical staff check the CT image quality parameters manually on a phantom using available tools in the control panel. The QC procedure consists of daily, monthly, and annual tasks. To carry out thi...

We developed a software to automatically measure the linearity between the CT numbers and densities of objects using an ACR 464 CT phantom, and investigated the CT number linearity of 16 different CT scanners. The software included a segmentation-rotation method. After segmenting five objects within the phantom image, the software computed the mean...

Purpose: This study aims to develop a software tool for investigating patient centering profiles of axial CT images and to implement it to evaluate practices in three hospitals in Indonesia. Methods: The evaluation of patient centering accuracy was conducted by comparing the center coordinate of the patient’s image to the center coordinates of the...

Boron Neutron Capture Therapy (BNCT) is a relatively safer technology for killing cancer cells, one of which is the Glioblastoma multiforme. One of the main components of the BNCT equipment is the collimator which functions as an exit point for epithermal neutron particles that hit cancer cells. In addition to the experimental method, BNCT research...

Thorax radiography examination in pediatric patients is one of the most frequent examinations because of many abnormalities that occur in the thorax and have a high probability at children's age. Pediatric patients are assisted by a companion from the adult patient's family. Calculation and measurement of the radiation dose received by the companio...

Previous study using thoracic phantom for estimating fluid volume has been obtained which represents the case of pleural effusion based on the size of the x-ray radiograph. The models are obtained in the form of three equations, the pleural effusion volume as a function of height, length times the height, and area of the radiograph image. The three...

Background: The effect of region of interest (ROI) size variation on producing accurate noise levels is not yet studied. Objective: This study aimed to evaluate the influence of ROI sizes on the accuracy of noise measurement in computed tomography (CT) by using images of a computational and American College of Radiology (ACR) phantoms. Material an...

Nowadays, development in urban areas is progressing very rapidly, accompanied by an increase in the number of residents and various kinds of activities carried out. Seeing this phenomenon, many developers are competing to build multi-layered high buildings. Air conditioning systems in high-rise buildings are generally carried out with artificial ai...

Analysis of impurity and trace element in liquid is urgently needed in environment and industries. In this present work, new sampling technique of laser induced breakdown spectroscopy (LIBS) has been devised using metal coarse utilizing pulse CO2 laser. Experimentally, a liquid and polluted liquid was dropped into a metal coarse powder. A pulse CO2...

Trace elemental identification of Cr deposited on a material target was made using metal-supported laser-induced breakdown spectroscopy. Experimentally, an almite material containing a trace element of Cr on its surface was perpendicularly placed on a Cu metal plate. A pulse CO2 laser beam was irradiated on the Cu plate to produce a plasma. The pla...

Objective: The aim of this study is to investigate image qualities filtered by a selective mean filter (SMF) and its comparison to an adaptive statistical iterative reconstruction (ASIR). Materials and Methods: A CT AAPM performance phantom was used for the assessment of basic image quality. The phantom was scanned by 128 Multiple Slices Computed T...

Corrosion is one of the main reasons for in-core accidents in liquid sodium-cooled fast reactors, especially accidents due to fuel cladding pipe damage. It is urgently required to investigate what kind of compound is produced as a corrosion product after the interaction between stainless steel and sodium in fast breeder reactors (FBR). In this work...

The size-specific dose estimate (SSDE) is an estimation of patient dose in computed tomography (CT). The SSDE strongly depends on the water-equivalent diameter (DW). In abdominal CT examinations, contrast agent is sometimes used to more clearly visualize tissue lesions. The Hounsfield unit (HU) of CT images with and without the use of contrast agen...

Optimization of radiation dose is very important in protecting patients against the dangers of x-ray radiation. Optimization of the dose should be able to provide image quality that is acceptable to radiologists for diagnostic purposes with the lowest possible doses. The optimization tool in computed tomography scanner (CT scan) is known as the dia...

Background: It is necessary to have an automated noise measurement system working accurately to optimize dose in computerized tomography (CT) examinations. Objective: This study aims to develop an algorithm to automate noise measurement that can be implemented in CT images of all body regions. Materials and methods: In this retrospective study...

This study implements a selective mean filter (SMF) and determines its effectiveness on computed radiography (CR) images. A phantom of the Kualitas Citra Imajing (KUCING) was used. The effectiveness of the SMF was compared to the adaptive mean filter (AMF). The assessment of image quality was based on several parameters, such as the peak signal to...

The use of lead plates as shielding to X-ray radiation has the disadvantages of being heavier and not environmentally friendly when compared to other materials. Currently, metal foam technology is developed that is expected to be close to the ability of lead plate as a radiation shielding that is lighter and environmentally friendly. This research...

Krisis energi dan pemanasan global menjadi isu penting sampai saat ini. Idealnya sebuah bangunan mempunyai nilai estetis, berfungsi sebagaimana tujuan bangunan tersebut dirancang, memberikan rasa aman (dari gangguan alam dan manusia/ makhluk lain), serta memberikan kenyamanan, akan tetapi juga memberikan dampak bagi penghematan energi bangunan ters...

This study aims to analyze the effect of distance and fluoro time on increasing workers radiation dose inside Cath Lab room. Also to analyze the differences results of TLD and Pocket dosimeter in determining workers radiation dose. There are 254 data is needed for statistical analysis, 206 data for analyzing the relation of distance and Fluoro-time...

Laser induced breakdown is a highly temporally and spatially dynamic phenomenon, normally studied using a highly temporally resolved optical detector system. In this work, a compact, low cost optical multichannel analyzer (OMA) system without a built-in temporal gating device and thus operated under a free running mode was used to investigate the c...

Analysis of light elements such as H in metal sample is very imperative to be carried out. In this work, identification and analysis of H element in zircaloy metal sample has been conducted by using Nd:YAG laser-induced breakdown spectroscopy. Experimentally, a pulse Nd:YAG laser beam was focused on a zircaloy metal sample containing H in the He ga...

Background: One tool for CT dose reduction is using noise reduction. However, an application of it reduces image quality. Objectives: This study proposes a selective mean filter (SMF) and evaluates its effectiveness for noise suppression in CT images. Methods: This study is an experimental study on the new noise reduction algorithm. The proposed al...

The purpose of this study was to develop a computational phantom for validation of automatic noise calculations applied to all parts of the body, to investigate kernel size in determining noise, and to validate the accuracy of automatic noise calculation for several noise levels. The phantom consisted of objects with a very wide range of HU values,...

This study aims to implement noise reduction algorithm with a selected mean filter (SMF) and to investigate its computation time in the denoising process on X-ray fluoroscopy images. The SMF was the mean filter (MF) technique, but in its application, selected pixels within threshold value were only used to calculate the average pixel value. The eff...

Trace elemental analysis on a surface of material has been recently imperative to be carried out especially in material industries. In this study, sophisticated setup of laser-induced breakdown spectroscopy has been arranged and demonstrated by employing vaporization technique for the trace elemental analysis on a surface of material without ablati...

Humans in carrying out daily activities always need sunlight. Nature has provided an abundant source of energy, solar heat. Indonesia is on the equator very rich in energy from sunlight. Sunlight has not been used by humans and seems to be refused entry into the room. The reading room is one of the facilities in the library. The reading room requir...

Laser-induced breakdown spectroscopy (LIBS) to detect the light elements such as lithium (Li) and boron (B) and heavy elements such as copper (Cu) and lead (Pb) in raw fish samples is reported in this work. This is made possible by understanding that the soft target absorbs recoil energy and as a result, the ablated atoms gushing from the soft targ...

We have developed an improved method of modulation transfer function (MTF) measurement using an edge of the polymethyl methacrylate (PMMA) phantom which is normally positioned for computed tomography dose index (CTDI) measurement. In CTDI measurements, the peripheral holes of the PMMA phantom are set at the 3, 6, 9 and 12 o'clock positions. The upp...

Proper positioning of the patient in the CT examination is important. Patients who are not properly positioned at iso-center can affect the distribution of radiation dose. Every patient is unique, hence matching a center of the patient with the iso-center is not a trivial task. This study has developed a system for automatic patient centering using...

Identifikasi kandungan zat makro pada obat-obatan kimia sangat diperlukan untuk tujuan perlindungan kesehatan masyarakat. Dalam penelitian ini, identifikasi magnesium (Mg) dalam produk farmasi dilakukan menggunakan LIPS (Laser-Induced Plasma Spectroscopy). Laser yang digunakan pada penelitian adalah laser Nd: YAG dan laser CO2. sampel yang digunaka...

p> Alfairus Mosque is a mosque that has a design concept that adopts the design of the Nabawi mosque. The building that adopted the design of the Nabawi mosque in Medina has a characteristic high and wide openings on the outer facade with a combination of arch ornaments like most Persian mosque designs. This research focuses on the effect of openin...

This study aims to determine the effect of the grid ratio on the quality of the radiographic examination of a head phantom. The study was conducted by using grid ratios of 5:1, 6:1, and 8:1, the head phantom. The focus-film distance (FFD) was 100 cm. In the antero-posterior projection used voltages of 70, 75, and 80 kVp with a current-time of 25 mA...

Identification of elements in human blood is very useful for diagnosis of human diseases based on human blood. In this study, laser-induced breakdown spectroscopy has been employed to identify elements in human serum blood. Experimentally, a pulse Nd:YAG laser (1064 nm, 54 mJ, 10 ns) was focused on a sample surface, which was prepared in the form o...

This study develops an algorithm for multiple-windows blending of CT images in red-green-blue (RGB) color space. A CT image is windowed at three different combinations of window width (WW) and window level (WL) values. The first window image is then colorized red (R), the second window image is colorized green (G), and the third window image is col...

MIRD has developed methods, assumptions, models, and mathematical formulae for estimating internal radiation doses from the injected radiopharmaceuticals into the body. This study aims to determine the radiopharmaceutical distribution of Cobalt 57 MIBI in patients identified as having breast cancer by using an oncology examination with MIRD method...

p> Saint Peter Church Sambiroto located in the Semarang City which has tropical climate. The building has many openings like doors and bouvenlights. Currently in the east corridor are given tents to accommodate the number of congregations that exist, and on the east side the hallway is paired with banner to protect the east hallway from sun’s heat....

The synthesis of gold nanoparticles with high-purity and narrow size distribution is necessary for applications in the medical field. However, it is difficult to achieve this using chemical methods. In this study, the pulse laser ablation method using an Nd:YAG laser operated at a low-energy of 30 mJ has been successfully employed to produce gold n...

This study developed a simple wire phantom and an algorithm to automatically measure the modulation transfer function (MTF) in computed tomography (CT), and implemented it to evaluate the effect of focal spot size and reconstruction filter type. The phantom consisted of a resin cylinder filled with water, with a tin wire of diameter 0.1 mm position...

We investigated comparisons between patient dose and noise in pelvic, abdominal, thoracic and head CT images using an automatic method. 113 patient images (37 pelvis, 34 abdominal, 25 thoracic, and 17 head examinations) were retrospectively and automatically examined in this study. Water-equivalent diameter (Dw), size-specific dose estimates (SSDE)...

This study aims to evaluate the effect of tube current on noise and low contrast resolution in CT scan images. Determination of the noise and the low contrast resolution was carried out using the built-in phantom of CT scan. To determine the noise, a phantom section consisting of homogeneous water (water filled phantom) was used, and to determine t...

We validated the tail replacement technique in the modulation transfer function (MTF) calculation of CT images using edges of homogeneous and non-homogeneous phantom using an automated method. The algorithm for the automated MTF calculation consists of several steps. The upper edge of the phantom was detected from its axial image and pixel values w...

This study is aimed at elucidating the physical processes responsible for the excellent spectral qualities in terms of full width at half maximum (FWHM) and signal to noise (S/N) ratio shown in a special double pulse laser induced spectroscopy. A part from the use of atmospheric He ambient gas, the achievement is due to the first laser for generati...

Impurity analysis in the material surface urgently required in various fields such as material sciences and industries. In this research, a new technique was devised based on a pulse CO 2 laser. Technically, the surface of the almite material as a material target was covered by a metal mesh. To induce a big-size plasma, the pulse CO 2 laser was dir...

Analysis of carbon (C) in soil has been successfully made by laser plasma spectroscopy using a pulsed carbon dioxide (CO2) laser. Fine particles of soil sample were attached on a surface of the metal subtarget by adding a small amount of moisture; the metal was used to initiate the gas plasma. Experimentally, a pulsed laser was focused on the subta...

An architectural work can be seen in terms of benefits for the community where it can provide something to support life and advance the development of the surrounding environment. In this case the case study raised was at the University of Indonesia Library, where the library was very supportive of students on campus and outside the campus.The prob...

The conditions of houses in densely populated areas vary, some use brick and Hebel materials. the high density of an area makes air movement not work properly so that the temperature in the area of the region increases and will have an effect on the inner space of the houses in the settlement. therefore the purpose of this study is to find out the...

New devised metal subtarget technique has been developed for specific applications of liquid analysis. Experimentally, liquid material was homogeneously poured on a surface of metal plate, which functions as a metal subtarget. The metal surface was then dried using drying machine. When a pulse CO2 laser (10.64 μm) was irradiated on a metal subtarge...

The laser induced breakdown spectroscopy (LIBS) experiment with a unique double pulse setup and operational procedure in low pressure (3 kPa) He ambient gas is performed for the study on the detection of light elements such as hydrogen (H) and deuterium (D) as well as elements of high excitation energies such as fluorine (F) and chlorine (Cl) which...

Background Hydrogen (H) and Carbon (C) are major elements that occur in various materials, including organic matter. The identification and analysis of C and H are necessary for several fields. LIBS is an excellent method for such analysis because it is rapid, and can be conducted remotely. The technique has been employed for the analysis of H in z...

Purpose: The purpose of this study was to introduce a new algorithm for automated measurement of the modulation transfer function (MTF) using an edge of a readily available phantom and to evaluate the effect of reconstruction filter and field of view (FOV) on the spatial resolution in the CT images. Methods: Our automated MTF measurement consist...

Data S1. Codes of the automated MTF calculation.

This research involves the study of two models of green facades and a model of bare wall. A house miniature was used as thermal lab. The aim of the project is evaluating the performance of energy transfer based on the various leaves densities on the green facade. Heat calculation was used to calculate heat transfer on the wall surface. There are tw...

Laser-induced gas plasma spectroscopy based on pulsed CO2 laser beam splitting has been applied to the problem of trace film analysis on the silicon surface. In this study, 2.1 J of laser energy (70% of the laser beam) was focused at a 10-degree incidence on a metal mesh attached to a sample surface containing trace metal elements in order to produ...

This paper presents crack detection in concrete built infrastructure using fiber optic sensors based on the pressure measurement system. Fiber optic sensors in this experimental study were constructed using micro-bending techniques. The bends in optical fiber were evaluated based on pressures given by Compression Testing Machine (CTM). Pressure was...

Identification of the authenticity of silver jewelry has been carried out by using laser induced shockwaves plasma spectroscopy (LISPS) method. In this study, a plasma was generated by laser firing Nd: YAG (1064 nm, 40 mJ, 7 Hz) at a pressure of 1.5 torr to the target surface. The study was made to distinguish 99.9 % silver samples, 92.5 % silver j...

Identification of macro nutrients in medicine is really necessary for healthy purpose. In this study, identification of macro elements in pharmaceutical products was carried out by laser-induced plasma spectroscopy (LIPS). A comparative study was made by employing different types of laser, namely an Nd:YAG laser and a pulse TEA CO2 laser. Experimen...

A rapid detection of heavy metals in soil was presented by the metal-assisted gas plasma method using specific characteristics of a pulsed, transversely excited atmospheric (TEA) CO2 laser. The soil particles were placed in a hole made of acrylic plate. The sample was covered by a to prevent the soil particles from being blown off. The mesh also fu...

The outside corridor of Dutch Colonial Building in Indonesia was made to make the temperature of the room more comfortable. Lawang Sewu Building in Semarang is one example of a building that has an outside corridor along the building and until now still use natural ventilation. This study focuses on finding out whether there is a difference on the...

This study discusses the dose rate in digital radiography room, buit according to meet the provisions of KEMENKES No.1014 / Menkes / SK / XI / 2008 and Regulation of BAPETEN No. 8 / 2011. The provisions primary concern of radiation safety, not comfort, by considering the space design. There are five aspects to consider in designing the space: funct...

High-purity gold nanoparticles (GNPs) has been successfully synthesized by using laser ablation method utilizing low-power neodymium yttrium aluminum garnet (Nd:YAG) laser at the fundamental wavelength. Experimentally, pulse laser beam (Nd:YAG laser, 1064 nm, 7 ns, 30 mJ) was directed and focused onto a high-purity gold sheet (99.95%), which was pl...

Daylighting with light-shelf is not a simple strategy. Therefore, this research aims to investigate how far the application of light-shelf can block direct sunlight and how much the distribution of daylight at office rooms is produced. This research is a simulation using EnergyPlus from OpenStudio. Data as measurement results collected from on-site...

Predicting osteoarthritis using knee radiograph is challanging. This study intend to correlate Joint Space Width (JSW) and Tibiofemoral Angle (TFA) measurement with an osteoarthritis biomarker value to predict osteoarthritis in knee pain. The selected 36 respondents who had knee pain participated in this cross sectional study. All participants had...

TiO2 thin film can be deposited on the silicon substrate using pulse laser deposition method. To prove homogeneity of grain size on surface, this study uses milling treatment for TiO2 powder before it is deposited. Milling treatment was conducted on samples of commercial TiO2 powder with high energy milling method. The variation of milling time was...

This study is aimed at developing an empirical model to estimate the heating value of municipal solid waste as a function of its element content (C, H, N, S, O). A correlation was developed using stepwise multiple regression analysis based on 29 samples of municipal solid waste that were randomly selected and gathered from 29 different areas in Sem...

Detection of oil pollution in soil has been carried out using laser-induced breakdown spectroscopy (LIBS). A pulsed neodymium-doped yttrium aluminum garnet (Nd:YAG) laser (1,064 nm, 8 ns, 200 mJ) was focused onto pelletized soil samples. Emission spectra were obtained from oil-contaminated soil and clean soil. The contaminated soil had almost the s...

This paper presents a study about vertical garden as one of the most popular greenery systems in the modern era. The aims of this research are to study the thermal performance of the vertical garden in the office building and the influence of weather parameter toward the thermal performance of vertical garden. The object study was the application o...

The processes of Biological treatment intend to reduce the organic matter content by using microorganisms. Problems, which often occur in the treatment process, include the Wastewater Treatment Plant (WWTP) being planned for treating domestic wastewater only, but in fact the WWTP often receives non-domestic wastewater particularly direct or indirec...

ABSTRAK, FAKTOR KOREKSI SOLID WATER PHANTOM TERHADAP WATER PHANTOM PADA DOSIMETRI ABSOLUT BERKAS ELEKTRON PESAWAT LINAC. Telah dilakukan studi untuk menentukan faktor koreksi solid water phantom terhadap water phantom pada kalibrasi dosimetri absolut pada untuk berkas elektron 5, 7, 8, 10, 12 dan 14 MeV dari pesawat Linear Accelerator Siemens Primu...

In many countries, greenery aspect in urban area becomes an important consideration. Because of the unstoppable force of urbanization, quantities of natural vegetation decrease. Applying vegetation on the building office may gives us a lot of benefit. It is not only for building aestetic but also to provide interior thermal comfort for the building...

This paper presents a model for natural systems used in Wastewater Treatment Plant (WWTP) Sewon Bantul. The model is modeling development, derived from the physical and biochemical phenomena involved in the biological treatment process. The numerical solution of the resulting on 13 simultaneous systems of nonlinear equations by the Quasi_Newton. Da...