Idam Arif

Idam Arif
Bandung Institute of Technology | ITB · Physics

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80
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Publications

Publications (80)
Technical Report
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IndoseCT is software to calculate and manage the radiation dose of a patient undergoing computed tomography (CT) examination. It does not only calculate the radiation output dose of CT machines (in terms of volume CT dose index, CTDIvol), but also the individual dose received by each patient (in terms of size-specific dose estimate, SSDE) either ba...
Technical Report
Full-text available
IndoseCT merupakan software untuk menghitung dan mendokumentasikan dosis radiasi dari setiap pasien yang menjalani pemeriksaan computed tomography (CT). Software ini tidak hanya menghitung dosis keluaran radiasi pesawat CT (dalam besaran volume CT dose index, CTDIvol), tetapi juga dosis individual yang diterima oleh setiap pasien (dalam besaran siz...
Article
Full-text available
The use of deep learning in medical image classification has become an important study in the past few years. The proper use of this method, however, is still hindered by many problems, one of it being the imbalance of dataset available for training which resulted in small-set database. In this study, the effect of noise-based augmentation on the p...
Article
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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...
Article
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Background: Gadolinium (Gd3+) is a chemical element belonging to the lanthanide group and commonly used in magnetic resonance imaging (MRI) as a contrast agent. However, recently, gadolinium has been reported deposition in the body after a patient receives multiple injections. Gadolinium is a potent block and competes with calcium diffusion into t...
Article
We proposed and evaluated a water-equivalent diameter calculation without using a region of interest (ROI), (D w,t), and compared it with the results of using a ROI fitted to the patient border (D w,f). Evaluations were carried out on thoracic and head CT images. We found that the difference between D w,t and D w,f was within 5% for all images in t...
Article
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The aims of this study were to investigate the noise reduction in a CT image using a modified Wiener filtering-edge detection method. We modified the noise reduction algorithm of a combination of the Wiener filter and edge detection by addition of a dilation stage after edge detection. We then evaluated kernel size of the Wiener filter, threshold v...
Article
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Music has an important role in our life nowadays. Music can affect emotions and brain activity that can be measured through brain waves as electrical signals produced by neurons to carry sensory and cognitive information. In this study, brain waves for 10-12 normal male-non musician undergraduate students under three kinds of treatment are read usi...
Article
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This study aims to develop a simple method for estimating the size-specific effective dose using the ImPACT software. The size-specific effective dose was calculated from the images of patients who underwent CT examinations of the thorax and abdomen regions. Volume computed tomography dose index (CTDI vol) and mAs data were obtained from the dose r...
Article
Full-text available
The aim of this study was to evaluate the eye lens dose due to miscentering, either above or under the isocenter, and to assess the possibility of eye lens dose reduction by using miscentering phenomenon. We used two types of phantoms (head CTDI and adult anthropomorphic phantoms) and two types of detectors (pencil ionization chamber and radiophoto...
Article
The aim of this study was to compare the values of the computed tomography dose index 100 (CTDI100) obtained using two small detectors (i.e. a small ionization chamber and a small solid state detector) with those obtained from a 100-mm pencil ionization chamber for various input CT parameters: beam width, kVp, mAs, pitch, and head-body phantom vari...
Article
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This study compared the spatial resolution and the amount of noise in CT images reconstructed using the iterative reconstruction (IR) and filtered back-projection (FBP) techniques. We used a circular homogeneous phantom (pixel value of 0.5) containing a small circle at its center, with a diameter of 0.53-cm and a pixel value of 1.0. In order to rec...
Article
Full-text available
The Monte Carlo codes, EGSnrc and MCNPX, have been specifically developed to study the particles transport in linear accelerator used in radiotherapy. A simple X-ray target 6 MV photon beam geometry was chosen to highlight similarities and differences of particles transport algorithms implemented in these Monte Carlo codes. The purpose of this stud...
Article
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Gadolinium (Gd³⁺) is a commonly used in MRI. The role of Gd³⁺ as contrast agent greatly helps to improve the quality of an image and Gadolinium entrance in a body through a diffusion process after administration. Diffusion process takes place from outside pre-synapse to inside pre-synapse through Ca²⁺ channels. This process causes a delay of Ca²⁺ i...
Article
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NN-MOIRT has been proposed earlier as an alternative for existing image reconstruction algorithms that can accurately show a volumetric image in a cylindrical sensor vessel. The Brain ECVT sensor has a different shape and dimensions compared with a common ECVT sensor, which has a cylindrical shape. Using a different sensor changes the image reconst...
Article
Full-text available
Gadolinium oxide (Gd2O3) nanoparticles with paramagnetic properties and biocompatible surfaces are promising materials for bioimaging applications. We synthesized in situ pegylated Gd2O3 (Gd2O3@PEG) nanoparticles by liquid phase pulsed laser ablation (PLAL) of a gadolinium target in a polyethylene glycol (PEG) liquid medium. We characterized their...
Article
Full-text available
Background: In the tube current modulation (TCM) technique, tube current is changed dynamically during the scanning process. To quantify the effect of a dynamic tube current, a distinct calculator is needed to estimate the CT output radiation dose in terms of volume CT dose index (CTDIvol) and individual patient dose in terms of size-specific dose...
Article
The purpose of this study is to establish the relationship between the pixel value (I) of the CT localizer radiograph and water-equivalent thickness (tw) in a straightforward procedure. We used a body CTDI phantom, which was scanned in the AP and LAT projections. After transformation from the pixel values of the images to tw, water-equivalent diame...
Article
Full-text available
This paper presents an EEG study for coherence and phase synchrony in mild cognitive impairment (MCI) subjects. MCI is characterized by cognitive decline, which is an early stage of Alzheimer’s disease (AD). AD is a neurodegenerative disorder with symptoms such as memory loss and cognitive impairment. EEG coherence is a statistical measure of corre...
Article
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Autism Spectrum Disorders (ASD) adalah kondisi neurodevelopmental yang berkaitan dengan defisit dalam fungsi eksekutif, emosi, bahasa, dan komunikasi sosial. Beberapa teknik neuroimaging dan neurofisiologi digunakan untuk memahami hubungan antara fungsionalitas otak dan perilaku autis. Quantitative Electroencephalography (QEEG) adalah sebuah teknik...
Technical Report
Full-text available
IndoseCT 15.a merupakan software untuk menghitung dan mendokumentasikan dosis radiasi dari setiap pasien yang menjalani pemeriksaan CT scan. Software ini tidak hanya menghitung keluaran radiasi pesawat CT (dalam besaran CTDIvol), tetapi juga dosis individual setiap pasien (dalam besaran size-specific dose estimate, SSDE) baik berdasarkan diameter e...
Article
Full-text available
Probabilistic dose assessment and mapping for nuclear accident condition are performed for Ujung Lemahabang site in Muria Peninsula region in Indonesia. Source term is obtained from Three-Mile Island unit 2 (TMI-2) PWR-type SB-LOCA reactor accident inverse modeling. Effluent consisted of Xe-133, Kr-88, I-131, and Cs-137 released from a 50 m stack....
Article
Full-text available
The CT dose index (CTDI) is usually measured using a pencil chamber with a length of 100 mm on a CTDI phantom with a length of 150 mm. The scattering radiation dose beyond 100 mm is usually still significant despite using a small beam width (below 10 mm). This study aims to measure the scattering index of CT dose for several variations of input par...
Article
The purpose of this study is to investigate truncated axial computed tomography (CT) images in the clinical environment and to produce correction factors for abdomen, thoracic and head regions based on clinical data, in order to accurately predict the water-equivalent diameter (DW) and size-specific dose estimate (SSDE). We investigated axial image...
Article
Full-text available
Effective diameter (Deff) Size-specific dose estimate (SSDE) Volume CT dose index (CTDIvol) CT scanner Information on the effective diameter (Deff) is essential for estimating the dose for patients undergoing CT examinations. The purpose of this study was to calculate the effective diameter using the maximum values of lateral (LAT) and anterior-pos...
Article
The use of parameters water equivalent diameter (DW) and size-specific dose estimate (SSDE) are becoming increasingly established as a recognised method to relate patient dose from a CT examination to the dose indicator volume CT dose index (CTDIVOL). However, the role of the attenuation due to the patient table in these estimations requires carefu...
Conference Paper
CUDA EGS was CUDA implementation to simulate transport photon in a material based on Monte Carlo algorithm for X-ray imaging. The objective of this study was to investigate the effect of inhomogeneities in inhomogeneity phantom for small field dosimetry (1×1, 2×2, 3×3, 4×4 and 5×5 cm²). Two phantoms, homogeneity and inhomogeneity phantom were used....
Conference Paper
This paper examines the differences of EEG power and coherence between bipolar disorder patients and healthy subjects in the resting state. Observations are focused on the prefrontal cortex area by calculating intra-hemisphere and inter-hemisphere coherence.EEGdata acquisition are conducted by using wireless Emotiv Epoc on AF3, AF4, FC5, FC6, F7 an...
Article
Full-text available
The purpose of this study is to accurately predict the profile of patient dose in terms of size-specific dose estimate (SSDE) along the longitudinal axis in a CT using tube current modulation (TCM). The head-thorax and abdomen-pelvic examinations were evaluated. The volume CT dose index (CTDIVOL) values were extracted from the DICOM header. It was...
Article
Full-text available
Background: The lack of lateral electronic disequilibrium (LED) becomes a main problem in small field. This factor affects the dose in target volume cannot predict correctly. In addi"on, u"liza"on of high-energy linear accelerator (10 MV) can emit some unwanted par"cles (electron contamina"on). Therefore, the aim of this study was to characterize h...
Article
Full-text available
The purpose of this study is to expand a descriptor for estimating the total energy imparted to a patient undergoing a CT examination and to investigate its relationship to the currently used descriptor. Estimating the total energy imparted to a patient has previously been characterized by dose-length product (DLP). We propose a descriptor which we...
Article
Full-text available
The purpose of this study is to investigate eye radiation dose for an individual patient. The eye dose can be estimated directly using the exponential relationships between the normalized organ dose and the average of local and global water-equivalent diameter (WED) with appropriate A and B coefficients. The eye dose estimation was carried out on f...
Article
Full-text available
The objective of this study is to investigate the inhomogeneity effect in inhomogeneous phantom using dosimetric parameters which are the percentage depth dose (PDD) and lateral profile. The accelerator treatment head used in this study was Varian Trilogy Clinac iX 6 MV photon beam. BEAMnrc Monte Carlo (MC) code system was used to design this linea...
Article
Full-text available
Treatment fields consist of tissue other than water equivalent tissue (soft tissue, bones, lungs, etc.). The inhomogeneity effect can be investigated by Monte Carlo (MC) simulation. MC simulation of the radiation transport in an absorbing medium is the most accurate method for dose calculation in radiotherapy. The aim of this work is to evaluate th...
Conference Paper
Full-text available
Abstrak Tujuan penelitian ini adalah untuk menginvestigasi perbedaan aktivitas kelistrikan otak sinyal Electroencephalogram (EEG) pada penderita skizofrenia dan kelompok kontrol menggunakan teknik analisis spektral entropi. Sampel pada penelitian ini sebanyak 8 orang, terdiri dari 4 orang penderita skizofrenia dan 4 orang subjek normal sebagai kelo...
Article
Full-text available
The purpose of this study is to accurately and effectively automate the calculation of the water‐equivalent diameter (DW) from 3D CT images for estimating the size‐specific dose. DW is the metric that characterizes the patient size and attenuation. In this study, DW was calculated for standard CTDI phantoms and patient images. Two types of phantom...
Article
Full-text available
The purpose of this study was to investigate the characteristics of electron contamination and Output Factors (OFs) from Varian Trilogy Clinac iX 6 MV photon beam at small field sizes. EGSnrc Monte Carlo (MC) code system was used to model the photon beam for this Linear Accelerator (Linac) head and analyze the electron contamination and OFs from th...
Article
Paramagnetic polyethylene glycol (PEG) functionalized gadolinium oxide (Gd2O3@PEG) nanoparticles were synthesized by a facile thermal decomposition of gadolinium acetate hydrate (Gd(CH3CO2)3·XH2O) precursors in PEG-1000. PEG-1000 was used as a solvent, and as a size reducing and functionalizing agent. The advantages of the present method are that i...
Article
Full-text available
The purpose of this study is to automatically calculate and then investigate the size- specific dose estimate (SSDE) in thoracic and head CT examinations undertaken using standard imaging protocols. The effective diameter (Deff), the water equivalent diameter (Dw), and the SSDE were calculated automatically from patient images. We investigated sixt...
Article
Full-text available
Understanding a structure, function and molecular mechanisms of a cell are not easy. Even though, it is difficult, but it still has a solution to be investigated. The aim of this study is to investigate the compartment model as a structure of a cell and diffusion process inside a cell and nucleus by using Monte Carlo simulation. MCell was used to a...
Article
Full-text available
High energy medical accelerators are commonly used in radiotherapy to increase the effectiveness of treatments. As we know neutrons can be emitted from a medical accelerator if there is an incident of X-ray that hits any of its materials. This issue becomes a point of view of many researchers. The neutron contamination has caused many problems such...
Article
Full-text available
The profile of the CT scan output dose is crucial for establishing the patient dose profile. The purpose of this study is to investigate the profile of the CT scan output dose in both axial and helical modes using convolution. A single scan output dose profile (SSDP) in the center of a head phantom was measured using a solid-state detector. The mul...
Article
Full-text available
This research aims to study brain's electrical signals recorded using EEG as a basis for the diagnosis of patients with Alzheimer's Disease (AD). The subjects consisted of patients with AD, and normal subjects are used as the control. Brain signals are recorded for 3 minutes in a relaxed condition and with eyes closed. The data is processed using p...
Conference Paper
PEGylated gadolinium carbonate ((Gd2(CO3)3)@PEG) powder was successfully synthesized by a modified solvothermal method. The synthesized products were characterized by means of X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDS). A systematic chan...
Article
Full-text available
Salinity is a constraint to the sustainable agricultural production. Increasing salinity is found to inhibit growth, height, and total of leaf area ofrice from vegetative to generative stages. Electrophysiologically, increasing salinity and exposure duration reduce the PD of the plant leaves. The screening focuses on the response of six varieties o...
Article
New noise reduction method for reducing dose of CT scans has been proposed. The new method is expected to address the major problems in the noise reduction algorithm, i.e. the decreasing in the spatial resolution of the image. The proposed method was developed by combining adaptive Wiener filtering and edge detection algorithms. The first step, th...
Article
In this study, ECVT brain scanner is used to measure electrical signals generated by the activity of the human brain to the audio response. The basic principle of ECVT is the permittivity distribution mapping of objects based on data measured capacitance. Data capacitance is a response to changes in the permittivity distribution in the brain which...
Article
Biology system in our body is very complex. It includes urinary system, which consists of blood, kidney, ureter, bladder and urethra. A simple model using simulation was designed to approach this complex system. This study aimed at implementing the Monte Carlo simulation for investigation the urinary system based on the kinetic theory. MCell as Mon...
Article
In this paper, a new approach of automated calculation of effective diameter from 3D CT image in DICOM format is proposed. This effective diameter is used to assess the Size-Specific Dose estimates (SSDE). The SSDE is the appropriate metric to indicate the estimation of patient’s dose, while the volume computed tomography dose index (CTDIvol) is th...
Conference Paper
Thermalhydraulic of reactor core is the thermal study on fluids within the core reactor, i.e. analysis of the thermal energy transfer process produced by fission reaction from fuel to the reactor coolant. This study include of coolant temperature and reactor power density distribution. The purposes of this analysis in the design of nuclear power pl...
Conference Paper
A dynamical-systems model of plasma glucose, insulin and glucagon concentrations has been developed to investigate the effects of insulin therapy on blood glucose, insulin and glucagon regulations in type 1 diabetic patients. Simulation results show that the normal regulation of blood glucose concentration depends on insulin and glucagon concentrat...
Conference Paper
Full-text available
Recently, Monte Carlo (MC) calculation method has reported as the most accurate method of predicting dose distributions in radiotherapy. The MC code system (especially DOSXYZnrc) has been used to investigate the different voxel (volume elements) sizes effect on the accuracy of dose distributions. To investigate this effect on dosimetry parameters,...
Conference Paper
Full-text available
The aim of this study was to reduce noise in CT images (512 x 512) reconstructed by filtered back-projection (FBP) using Wiener and median filters. A homogeneous phantom was used, consisting of two circles with diameters 255 (inner circle) and 256 (outer circle) pixels. The pixel values of the outer and inner circles were 1.8 and 0.8, respectively....
Conference Paper
Full-text available
Abstrak Telah dilakukan pemetaan spasial 2D distribusi potensial listrik gelombang EEG pada penderita skizofrenia dan subjek normal. Sampel pada penelitian ini sebanyak 4 orang, terdiri dari 2 penderita skizofrenia dan 2 orang subjek normal sebagai kelompok kontrol. Perekaman data penderita skizofrenia dilakukan di Rumah Sakit Jiwa Provinsi Jawa Ba...
Article
Full-text available
Abstrak Penyakit Alzheimer (Alzheimer's Disease, AD) merupakan gangguan neurodegeneratif progresif yang terkait dengan gangguan fungsi neuronal dan kerusakan kognisi, fungsi, dan perilaku secara bertahap. Ada dua teori tentang penyebab terjadinya AD. Pertama dari luar sel, adanya penumpukan peptida amyloid yang disekresikan oleh sel-sel otak sehing...
Conference Paper
In this study, peritoneal dialysis transport system was numerically simulated using finite difference method. The increase in the intraperitoneal pressure due to coughing has a high value outside the working area of the void volume fraction of the hydrostatic pressure θ(P). Therefore to illustrate the effects of the pressure increment, the pressure...
Article
Full-text available
Neutronic performance of small long-life boiling water reactors (BWR) with thorium nitride based fuel has been performed. A recent study conducted on BWR in tight lattice environments (with a lower moderator percentage) produces small power reactor which has some specifications, i.e. 10 years operation time, power density of 19.1 watt/cc and maximu...
Conference Paper
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Introduction: On image reconstruction from CT scan, the radiation beam is always modeled as a point source (PS), although in the reality, the source has always a focal spot with a certain size. The point source model does not take into account the penumbra. Therefore, this study focused on image reconstruction on CT images using a fan beam with a n...
Conference Paper
Full-text available
Introduction: The CTDIvol values indicate the output dose of CT scan, but do not indicate the estimation of patient dose. Estimation of patient dose should take into account the size of the patient, i.e. the effective diameter of the patient which varies from patient to patient. AAPM (2011) had introduced a new metric to estimate the patient dose b...
Conference Paper
Full-text available
A neutronic characteristic of small long-life Boiling Water Reactor (BWR) with thorium based fuel has been investigated. The objective of the present research is to compare neutronic characteristic of different burnable poison addition for hexagonal tight lattice cell for small long-life BWR with thorium based fuel. The use of thorium as a fertile...