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All Journal JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING Jurnal Teori dan Aplikasi Fisika
Diah Rahayu Ningtias
Akademi Teknik Elektro Medik Semarang
Astronomy Computer Science & IT Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Physics

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Comparative Test of the Effect of X-Ray Tube Current Analysis and Exposure Time on CR (Computed Radiography) Image Quality Diah Rahayu Ningtias; Bayu Wahyudi; Imam Tri Harsoyo
JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING Vol 6, No 1 (2022): Issues July 2022
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jite.v6i1.7334

Abstract

The medical image system in the form of digital examination results using Computed Radiography (CR) needs to be analyzed, this can be done by knowing the quality of the image contrast resolution and the quality of its spatial resolution. This study conducted a comparative test between two methods of analyzing contrast resolution of medical images. Image quality on Computed Radiography can be determined using contrast resolution analysis, namely calculating the CNR value and PSNR value. The study was carried out using a phantom to represent the density of the bone. The voltages used are 50 kV, 60 kV, 70 kV and 81 kV, respectively. With each voltage, the tube current and exposure time (mAs) were varied 1.6 mAs, 2 mAs, 4 mAs, 8 mAs, 16 mAs, and 32 mAs. The higher the CNR value obtained, the better the image quality. While the PSNR value to get the optimal quality of medical image contrast, the current-time variation of 4 mAs and 16 mAs must be used. Due to the time-current variation, a high PSNR value is obtained, which indicates that the noise of the medical image is getting smaller so that a good contrast quality of the medical image is obtained. Both of these methods can be used to test the suitability of X-ray device, especially for quality control of medical images
Rancang Bangun Water Seal Drainage (WSD) Khusus Thorax Diah Rahayu Ningtias; Bayu Wahyudi; Iqbal Firdaus
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 2 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i2.254

Abstract

A Water Seal Drainage (WSD) design was made to remove air and fluid from the pleural cavity in the thorax (lung cavity) using a connecting tube or chest tube to maintain the negative pressure of the cavity. Under normal circumstances, the pleural cavity has negative pressure and only a little pleural fluid is filled. Suction pumps have a high pressure with a pressure range of -10 kPa to -80 kPa. The pressure is large enough so that it is not suitable for thorax because it can cause damage to internal organs due to high pressure. WSD specifically for thorax has a low pressure which is below -5 kPa / -40 mmHg. This WSD is equipped with a hand switch, water level and automatic Arduino Uno based exhaust system which has a pressure below -26.6 kPa / -20 cmHg to suction and pressure below -3.4 kPa / -2.6 cmHg to remove liquid from the bottle . The hand switch itself functions as a manual control to make it easier for the user, while the level sensor functions as a safety level for fluid levels in the tool and also an automatic fluid disposal system so that it is more efficient.
Local Adaptive Thresholding Menggunakan Metode Sauvola sebagai Tahapan Pra Pengolahan pada Data Citra Isyarat ECG Mohammad Rofi'i; Diah Rahayu Ningtias
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v10i1.290

Abstract

Kondisi seseorang dapat diketahui dari aktivitas kelistrikan jantung yang telah direkam dan dicetak dalam bentuk electrocardiogram (ECG). Data ECG dapat digunakan dalam penelitian sebagai modalitas bahan untuk analisis dan diagnosis kondisi jantung. Data tersebut dapat berupa isyarat satu dimensi maupun isyarat dua dimensi dalam bentuk citra atau gambar. Pengolahan isyarat ECG yang diambil dari data cetak fisik di scan untuk mendapatkan data digital sehingga dapat diolah dengan menggunakan komputer. Penelitian ini bertujuan untuk mempersiapkan data citra ECG dalam tahap pra pengolahan yang siap diolah pada tahap selanjutnya, baik untuk keperluan analisis maupun diagnosis melalui data citra ECG. Sehingga diharapkan dapat memudahkan dan menampilkan hasil yang optimal untuk berbagai penelitian dengan modalitas data citra ECG.Algoritma yang diterapkan menggunakan metode pengambangan lokal dari sauvola tecnique. Dengan menggunakan nilai R sebesar 128 dan nilai k=0,34 telah menghasilkan citra isyarat ECG tersegmentasi yang bersih tanpa grid. Dengan melihat nilai MSE dan PSNR dari masing-masing metode menunjukkan algoritma sauvola mendapatkan hasil yang lebih baik dari pengambagan global.
Co-Authors Bayu Wahyudi Imam Tri Harsoyo Iqbal Firdaus Mohammad Rofi'i Mohammad Rofi'i