Ahmad Nasrul Norali
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Preferred name
Ahmad Nasrul Norali
Official Name
Ahmad Nasrul, Norali
Alternative Name
Norali, Ahmad Nasrul
Norali, A. N.
Norali, A. N.
Norali, Ahmad Nasrul Bin
Main Affiliation
Scopus Author ID
57210551450
Researcher ID
FQQ-2549-2022

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Simulation of Single Channel Magnetic Induction Tomography for Meningitis Detection by Using COMSOL Multiphysics

2021-11-25 , Aiman Abdulrahman Ahmed , Zulkarnay Zakaria , Ali M.H. , Anas Mohd Noor , Siti Fatimah Abdul Halim , Ahmad Nasrul Norali , Pusppanathan J. , Rahim R.A.

Meningitis is a inflammation of the meninges and the most common central nervous system (CNS) due to bacterial infection. Numbers of children who have bacterial meningitis are still high in recent 15 years regardless of the availability of newer antibiotics and preventive strategies. This research focuses on simulation using COMSOL Multiphysics on the design and development of magnetic induction tomography (MIT) system that emphasizes on a single channel rotatable of brain tissue imaging. The purpose of this simulation is to test the capability of the developed MIT system in detecting the change in conductivity and to identify the suitable transmitter-receiver pair and the optimum frequency based on phase shift measurement technique for detecting the conductivity property distribution of brain tissues. The obtained result verified that the performance of the square coil with 12 number of turns (5Tx-12Rx) with 10MHz frequency has been identified as the suitable transmitter-receiver pair and the optimum frequency for detecting the conductivity property distribution of brain tissues.

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Design and evaluation of Magnetic Induction Spectroscopy probe for pH measurement in fetal hypoxia using COMSOL Multiphysics Simulation

2022-01-01 , Siti Fatimah Abdul Halim , Zakaria M.H. , Zulkarnay Zakaria , Aiman Abdulrahman Ahmed , Ahmad Nasrul Norali , Anas Mohd Noor , Jaysuman Bin Pusppanathan , Mohd Hafiz Fazalul Rahiman , Siti Zarina Mohd Muji , Ruzairi Abdul Rahim

Fetal Blood Sampling (FBS) is the term used to describe the current method of monitoring the foetal condition within the mother’s womb. FBS required the medical officer to make a small incision on the foetus’s head in order to collect blood for analysis of the blood pH level in order to prevent acidosis or foetal hypoxia. The FBS method, on the other hand, is invasive and increases the risk of infection for both mother and child. Magnetic Induction Spectroscopy (MIS) is a novel method for diagnosing the foetus’s pH level that is non-invasive and non-intrusive. A single channel MIS system is composed of a transmitter (TX), a receiver (RX), and an electrical circuit that generates and receives magnetic fields in response to the conductivity of the sample (blood) due to the presence of weak electrolytes (H+ and OH-). The purpose of this research is to develop and evaluate five different designs of TX-RX coils. The coils are designed using the Planar Zero Flow Coil (PZFC) concept, which allows for multiple coil configurations and input-output configurations. The results show that Design 2 open set model was the optimal coil design for MIS system probe, as well as some contributions to the pH evaluation process.

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A Review on Magnetic Induction Spectroscopy potential for fetal acidosis examination

2022-02-01 , Siti Fatimah Abdul Halim , Zulkarnay Zakaria , Pusppanathan J. , Anas Mohd Noor , Ahmad Nasrul Norali , Mohd Hafiz Fazalul Rahiman , Muji S.Z.M. , Rahim R.A. , Engku-Husna E.I. , Muhamad Khairul Ali Hassan , Muhammad Juhairi Aziz Safar , Ahmad Faizal Salleh , Mohd Hanafi Mat Som

Fetal acidosis is one of the main concerns during labor. Currently, fetal blood sampling (FBS) has become the most accurate measurement of acidosis detection. However, it is invasive and does not provide a real time measurement due to laboratory procedures. Delays in diagnosis of acidosis have caused serious injury to the fetus, especially for the brain and the heart. This paper reviews the new technique in diagnosis of acidosis non-invasively. Magnetic Induction Spectroscopy (MIS) has been proposed to be a new device for acidosis detection in recent years. This paper explains the basic principle of MIS and outlines the design specifications and design considerations for a MIS pH probe. It is expected that readers will gain a basic understanding of the development of a MIS pH probe from this review.

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Initial Results on Primary Field Cancellation of Magnetic Induction Spectroscopy Technique for Fetal Acidosis Detection using COMSOL Multiphysics

2021-11-25 , Siti Fatimah Abdul Halim , Mohd Hafiz Zakaria , Zulkarnay Zakaria , Ahmad Nasrul Norali , Anas Mohd Noor , Ahmed A.A. , Pusppanathan J. , Mohd Hafiz Fazalul Rahiman , Muji S.Z.M. , Rahim R.A.

Monitoring of fetal condition during labor could save hundred lives in a single year. During labor, fetus is at critical condition as acidosis may occur suddenly without any early symptoms. Invasive method such as Fetal Blood Sampling (FBS) has been used to detect the decline in pH level of fetus. However, fetal loss rate after FBS may range from 1.4% up to 25%. In this paper, magnetic field induction spectroscopy was implemented to determine fetal acidosis by using primary magnetic field cancellation technique. Magnetic Induction Spectroscopy (MIS) probe was design where transmitter coil (TX) is perpendicular to receiver coil (RX). The result shows that the secondary magnetic field produced have been successfully measured without any interruption from primary magnetic field. By using transmitter input 1A, it shows that voltage is inversely proportional to the blood pH due to the conductivity properties of blood.

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