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All Journal BERKALA FISIKA Indonesian Physical Review Jurnal Fisika dan Terapannya
Sri Dewi Astuty Ilyas
Department Of Physics, Hasanuddin University, Makassar 90245
Education Physics

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ANALISIS MODULATION TRANSFER FUNCTION (MTF) DAN CONTRAST-TO-NOISE RATIO (CNR) CITRA CT SCAN UNTUK OPTIMASI KUALITAS CITRA Azhara, Mutiara Fatimah; Dewang, Syamsir; Rosyidah, Ulfah; Astuty, Sri Dewi; Somad, Bannu Abdul
BERKALA FISIKA Vol 28, No 1 (2025): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Salah satu parameter utama dalam kualitas citra CT scan untuk penegakan diagnosa adalah   resolusi kontras tinggi, yang dinyatakan dengan Modulation Transfer Function (MTF) dan resolusi kontras rendah, yang dinyatakan dalam contrast-to-noise ratio (CNR). MTF dan CNR menjadi kriteria penting untuk membandingkan protokol dosis tinggi dan dosis rendah, yang bergantung pada karakteristik obyek target. MTF mengkarakterisasi tingkat keburaman pada domain frekuensi sedangkan CNR mengkuantifikasi detektabilitas objek-objek kontras rendah. Penelitian ini menggunakan fantom American Association of Medical Physicists in Medicine (AAPM) sebagai obyek dengan variasi arus tabung dan tebal irisan. Citra dianalisis dengan software Radiant DICOM dan IndoQCT. Pengukuran dilakukan dengan dua variasi yaitu arus tabung 100, 130 dan 150 mA pada tegangan tabung 80 kV dan tebal irisan 2,5 mm. Sedangkan untuk variasi tebal irisan 1,25, 3,75, dan 5 mm pada tegangan tabung 80 kV dan arus tabung 125 mA. Hasil penelitian menunjukkan nilai MTF10 masing-masing variasi arus tabung berturut-turut 0,7 line/mm; 0,7 line/mm; dan 0,8 line/mm. Nilai MTF masing-masing variasi tebal irisan sama yaitu 0,7 line/mm. Nilai CNR pada variasi arus tabung sebesar 2,548; 3,016; dan 3,482 serta pada variasi tebal irisan diperoleh 2,308; 2,613; dan 2,735. Semakin besar nilai arus tabung dan tebal irisan, maka nilai MTF semakin tinggi demikian pula untuk nilai CNR.
Analisis Nilai Entrance Skin Dose (ESD) dan Dosis Hamburan pada Area Tiroid dan Area Gonad pada Phantom PMMA Planar Menggunakan Pesawat Fluoroskopi C-Arm Asmayati; Astuty, Sri Dewi; Prastowo, Alan Tanjung Aji; Dewang, Syamsir; Ibrahim, Ajeng Anggreny; Pratiwi, Ayu Hardianti
JFT : Jurnal Fisika dan Terapannya Vol 12 No 1 (2025): Juni 2025
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v12i1.55995

Abstract

A study has been conducted analyzing the Entrance Skin Dose (ESD) value on PMMA phantoms based on variations in Field of View (FOV) and thickness. In addition, the magnitude of the dose scattering that reaches the thyroid and gonad areas of radiation workers when C-Arm fluoroscopy examination is performed was also tested. The variation in phantom thickness values ​​was 15, 20, and 25 cm while the variation in FOV irradiation values ​​was 12, 15, 17, and 20 cm. The purpose of the study was to determine the magnitude of the change in ESD value due to changes in object thickness which will also directly affect changes in peak voltage for each irradiation. This also has implications for providing an increasing scattering dose due to the presence of the object. The results showed that the larger the FOV and thickness of the phantom, the higher the ESD value received. At a phantom thickness of 25 cm, ESD increased from 6.42 mGy at a FOV of 12 cm to 11.61 mGy at a FOV of 17 cm. The scatter dose value that reaches the thyroid area is a maximum of 22.31 µSv at FOV 20 cm, while the gonad area receives 1.647 µSv, which is lower because the fluoroscopy machine is equipped with Pb protection for radiation workers when performing interventions. The conclusion in C-arm fluoroscopy examinations, radiation workers must also use protective equipment for other vital areas such as Pb glasses and neck protection to be safer from scattered radiation.
Pembuatan dan Uji Nilai HU Jaringan Tulang Buatan Berbahan Dasar Cangkang Telur Eunike Yusmaliani; Astuty, Sri Dewi; Purwanto; Dewang, Syamsir; Bannu; Ibrahim, Ajeng Anggreny; Pratiwi, Ayu Hardianti
JFT : Jurnal Fisika dan Terapannya Vol 12 No 1 (2025): Juni 2025
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v12i1.58374

Abstract

Performance evaluation of diagnostic radiology modalities strongly supports the quality of radiation and images for diagnosis. This test requires certain materials as a substitute for human objects to avoid excessive radiation. Phantom as one of the object replacement media has been directed according to the characteristics of the tissue. This study aims to obtain the radiation response of artificial bone tissue made from eggshells with the addition of rice bran, resin and catalyst, in 4 (four) mixture compositions. Test variations were carried out by changing the X-ray tube voltage (80 kV, 100 kV, 120 kV and 140 kV) to obtain CT-Scan images and analyzed using Radiant DICOM software. The results showed that the Hounsfield unit (HU) value of the artificial bone phantom corresponded to the HU value range of real bone organs, which is between 100 and 700 HU. This value affects the analysis of the resulting image resolution in the form of SNR and CNR values, in the range of (8.07-37.38) and (14.98-28.20), respectively. Conclusion Artificial bone tissue phantom made from eggshells and rice bran has the potential as a testing medium because it corresponds to the characteristics of human bones, especially in adulthood, and has the potential as a testing medium.
QUALITY CONTROL OF MULTI-SLICE CT-SCAN AIRCRAFT USING PHANTOM CHART MODEL 610 AT MAKASSAR HAJI HOSPITAL Fira, Nurul Magfirawati; Dewang, Syamsir; Astuty, Sri Dewi; Muliadin, Muliadin
Indonesian Physical Review Vol. 5 No. 1 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i1.136

Abstract

This study aims to determine and analyze the quality control phantom chart of a CT-scan plane from the CT number's accuracy, the CT number's uniformity, and the uniformity of noise against the phantom. The AAPM CT Performance Phantom with the model 610 offers a single object to measure several different CT performance parameters. The Phantom design is based on the guidelines presented in the AAPM. From the measurement results, the accuracy of the CT number is still following the tolerance standard; namely, the value of passing the test ± 4 for the accuracy of the CT number, and the value of passing the test 2 is the uniformity of the CT number. Based on the Standard Regulations of the Head of the Nuclear Energy Supervisory Agency, stating that the value of accuracy and uniformity of the CT number from the CT scan image obtained in research conducted on a multi-slice CT scan plane at the Radiology Installation of the Makassar Haji Regional General Hospital shows the value of passing the test or still within PERKA BAPETEN standard.
EFFECT OF ENERGY RADIANT LASER ON PHOTOANTIMICROBIAL TO DEGRADATION STAPHYLOCOCCUS EPIDERMIDIS BIOFILM CELLS MEDIATED SENSITIZER OF NANO SILVER-CHLOROPHYLL JATROPHA LEAF Astuty, Sri Dewi; Handayani, Yusri; Abdullah, Rismayani; Hajar, St.; Tabaika, Pryandi M.
Indonesian Physical Review Vol. 6 No. 1 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i1.214

Abstract

Chlorophyll compounds have been widely developed in photoinactivation research as organic photosensitizer agents, especially those extracted from green plants. Besides being natural and containing antimicrobial substances, the characteristic electronic properties of chlorophyll atomic have a long lifetime at the triplet level, so it is highly probable to produce Reactive Oxygen Singlet (ROS) while light activates. This phenomenon can potentially be applied in the mechanism of Photodynamic Therapy (PDT) or Photodynamic Inactivation (PDI) in various types of pathogenic bacteria that trigger infectious diseases. Laser light that activates photosensitizer molecules produces singlet oxygen which is reactive and toxic to microbial pathogens. In this study, will be found the efficacy of Jatropha leaf extracts combinate nano silver to inactivate biofilm cells of Staphylococcus epidermidis after being inducted by a red laser. Analysis of the research data quantitatively and qualitatively described the reduction in the number of biofilm cells and damage to the morphology of the biofilm cells with various energy radiant lasers applied through a scanning electron microscope (SEM) profile. The results showed that the photosensitizer agent, which combined Jatropha extracts with nano silver, obtained an inhibitory effect of 60% for the non-oxygenated group and 80% for the oxygenated group.
PHOTOINACTIVATION OF CANDIDA ALBICANS BIOFILM WITH GREEN LASER MEDIATED BY THE PAPAYA LEAF EXTRACT CHLOROPHYLL Abdullah, Rismayani; Astuty, Sri Dewi; Armynah, Bidayatul; Tabaika, Pryandi M; Imelda, Imelda
Indonesian Physical Review Vol. 8 No. 1 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i1.367

Abstract

This study aims to activate the effectiveness of Photodynamic Inactivation (PDI) as an antibacterial agent by using a green laser and papaya leaf chlorophyll extract to prevent Candida albicans cell death. Papaya leaf extract chlorophyll is known to have potential as a photosensitizer (PS) through its antimicrobial properties and ability to absorb optimal light photons at a wavelength range of 405–680 nm. Activation of chlorophyll molecules with appropriate light produces Reactive Oxygen Species (ROS), which are toxic to pathogenic microbes such as Candida albicans. The research method involves using PDI with a green laser light source and chlorophyll extract on Candida albicans biofilms. Four main treatment groups were applied, negative control (C-), positive controls with 10% (C1+) and 15% chlorophyll (C2+), irradiation for 60, 120, 180, 240, and 300 seconds (L1–L5), and combinations of irradiation with chlorophyll (L1F1–L5F2, where F1 for 10% chlorophyll and F2 for 15% chlorophyll), with measurements performed three times for each treatment. Living Candida albicans cells were detected using the XTT assay staining method. The results showed a significant decrease in activity in all treatment groups. Maximum activity was achieved in the L5F1 and L5F2 treatment groups with inactivation of 80% (p<0.05) and 83% (p<0.05), respectively. This study concludes that high papaya leaf extract chlorophyll concentrations combined with a green laser effectively inhibit Candida albicans biofilm.
IDENTIFIKASI LEVEL NOISE, RESOLUSI SPASIAL DAN LOW CONTRAST CITRA CT SCAN PADA OBJEK FANTOM RAHIM BUATAN Gunawan, Mutiara; Astuty, Sri Dewi; Dewang, Syamsir; Purwanto, Purwanto
BERKALA FISIKA Vol 27, No 2 (2024): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Kontrol kualitas radiasi maupun kualitas citra memegang peranan penting dalam uji kelayakan klinis suatu modalitas pesawat radiologi. Quality Control (QC) dilakukan untuk mematuhi standar yang diijinkan baik terhadap keluaran radiasi maupun hasil citra yang optimal untuk mendukung penegakan diagnosa. CT-scan merupakan salah satu perangkat diagnostik yang memerlukan pengujian QC citra medis yang kompleks karena memiliki banyak indikator penilaian seperti resolusi spasial, low contrastt, keseragaman noise, uniformity dan linearitas. Salah satu implementasi edukasi untuk penelitian terkait penggunaan radiasi adalah uji kualitas citra menggunakan fantom rahim buatan berbahan dasar agar, plastisin dan gel. Bagian dalam fantom diasumsikan sebagai jaringan kista (gumpalan darah lebih fluid), lesi (gumpalan darah lebih padat) dan kantung rahim (berisi air). Penelitian bertujuan untuk mengetahui kualitas citra CT-Scan fantom rahim berdasarkan nilai level noise, resolusi spasial (SNR) dan low contrastt (CNR dan MTF). Hasil penelitian menunjukkan bahwa tegangan 80 - 120 kV menghasilkan nilai SNR antara 5,72  - 6,60. Nilai CNR untuk jaringan kantung rahim berisi cairan sebesar 6,77, untuk jaringan lesi sebesar 19,56 dan untuk jaringan kista sebesar 192,15. Karakteristik nilai CTN untuk setiap objek yang diuji mendekati nilai jaringan yang sebenarnya dengan hasil uji kualitas citra fantom meningkat dengan
Co-Authors Abdullah, Rismayani Ajeng Anggreny Ibrahim, Ajeng Anggreny Ariguntar, Astrid Armynah, Bidayatul Arty, Nindy Asmayati Azhara, Mutiara Fatimah Bannu Dahlang Tahir Eunike Yusmaliani Fira, Nurul Magfirawati Gunawan, Mutiara Hajar, St. Hee Jae Kang Jumriah, Jumriah Khairul Bariah Marwah, Siti Ainun Muliadin, Muliadin Mulyadin, Mulyadin Mutmainna, Azri Prastowo, Alan Tanjung Aji Pratiwi, Ayu Hardianti Purwanto Purwanto Purwanto Rauf, Resmy Aulyah Rifaldi Rifaldi, Rifaldi Rosyidah, Ulfah S, Nurhidayanti S., Hikmawati Saharani, Nanda Salama, Rahmatullah Saleha Saleha Somad, Bannu Abdul Sulistiana Sulistiana, Sulistiana Syamsir Dewang Tabaika, Pryandi M Tabaika, Pryandi M. Yusri Handayani