scholarly journals Noise Citra dan Estimasi Dosis Radiasi dengan Aktifasi Sistem Automatic Exposure Control pada Pemeriksaan Computed Tomography Kepala

2015 ◽  
Vol 1 (2) ◽  
pp. 59-64
Author(s):  
Rini Indrati ◽  
Azlan Yazid ◽  
Bagus Abimanyu
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Activation Parameters ◽  
P Value ◽  
Exposure Control ◽  
Automatic Exposure Control ◽  
Dose Estimation ◽  
Ct Number ◽  
Tube Current ◽  
Head Computed Tomography

Background: Of the ways to maintain optimum image quality and reduce the intensity of radiation to patients is optimizing the value of tube current (mAs) using parameter of Automatic Exposure Control (AEC) or mA modulation. But at the fact in hospital, protocol parameter Automatic Exposure Control (AEC) is not activated or OFF on head computed tomography examination.Methods: This study was a quatitative experimental study. Subject of this study was head phantom. Phantom scanned with four treatments, the activation parameters was sure exp.3D-high quality, sure exp.3D-standard, sure exp.3D-low dose and AEC-OFF. Noise was analyzed using the standard deviation of the CT Number. The ROI of approximately 5 mm2 the intracranial area which is divided into three quadrants namely the anterior region, central region and posterior region of neck which is uniform are aof phantom.Results: The results showed significant differences when parameter automatic exposure control was activated and disabled or AEC-OFF with p value was 0.003 (0,05). Furthermore, based on the scanning results in a change of  radiation dose estimation to the highest doses value of the activation parameters of automatic exposure control and the lowest dose when parameter automatic exposure control deactivated or AEC-OFF.Conclusion: Activation parameters of automatic exposure control (sure exp. 3D) on a head CT examination image noise tends to decline and give a higher radiation dose than when parameter automatic exposure control deactivated or AEC-OFF.

scholarly journals Automatic Exposure Control And Fixed mA Technique To Radiation Dose And Image Quality On Non Contrast Urology CT Scan

2021 ◽  
Vol 16 (1) ◽  
pp. 8
Author(s):  
Sariyanto Ginanjar Kartasasmita ◽  
Mayarani Mayarani ◽  
Novan Hendra Hariyanto
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Radiation Dose ◽  
Ct Scan ◽  
Exposure Control ◽  
Automatic Exposure Control

Penelitian ini bertujuan untuk membandingkan nilai dosis radiasi dan kualitas gambar pada pemeriksaan CT Scanurologi non kontras dengan perbedaan teknik Automatic Exposure Control(AEC) dan teknik fixed mA. Desain penelitian ini adalah kuantitatif analitik. Penelitian ini dilakukan di Instalasi Radiologi RS Swasta di Jakarta Utara pada bulan Agustus – Oktober 2019. Jumlah sampel dari penelitian ini adalah 40 orang dengan empat perbedaan perlakuan dan masing-masing perlakuan berjumlah 10 pasien yang dipilih berdasarkan kriteria inklusi dan eksklusi. Metode pengumpulan data yang digunakan berupa observasi dan dokumentasi. Instrumen penelitian yang digunakan yaitu lembar kerja untuk mencatat data selama penelitian berlangsung dan komputer AdvantageWorkstation Computed Tomography ( AWCT) untuk mengukur nilai atau kualitas citra gambar CT Scan.Pengolahan dan analisis hasil data menggunakan program komputasi. Hasil dari penelitian penggunaan teknik Automatic Exposure Control(AEC) dapat memberikan dosis radiasi yang optimal dengan kualitas gambar CT Scan yang lebih baik dibandingkan dengan teknik fixed mA. Meskipun teknik fixed mA100 dapat memberikan nilai dosis radiasi yang lebih kecil dibandingkan teknik AEC tetapi menghasilkan kualitas gambar yang kurang baik

ESTIMATION OF RADIATION DOSE IN CT VENOGRAPHY OF THE LOWER EXTREMITIES: PHANTOM EXPERIMENTS USING DIFFERENT AUTOMATIC EXPOSURE CONTROL SETTINGS AND SCAN RANGES

2019 ◽  
Vol 188 (1) ◽  
pp. 109-116
Author(s):  
Yusuke Inoue ◽  
Hiroyasu Itoh ◽  
Kazunori Nagahara ◽  
Yuka Takahashi
Keyword(s):  
Radiation Dose ◽  
Effective Dose ◽  
Lower Extremities ◽  
Whole Body ◽  
Exposure Control ◽  
Automatic Exposure Control ◽  
Dose Length Product ◽  
Ct Venography ◽  
Tube Current ◽  
Phantom Experiments

Abstract We performed phantom experiments to assess radiation dose in computed tomography (CT) venography of the lower extremities. CT images of a whole-body phantom were acquired using different automatic exposure control settings and scan ranges, simulating CT venography. Tube current decreased in the lower extremities compared to the trunk. The scout direction and dose modulation strength affected tube current, dose length product (DLP) and effective dose. The middle and distal portions of the lower extremities contributed substantially to DLP but not to effective dose. When effective dose was estimated by multiplying DLP by a single conversion factor, overestimation was evident; this became more pronounced as the scan range narrowed. In CT venography of the lower extremities, the scout direction and modulation strength affect radiation dose. Use of DLP severely overestimates radiation dose and underestimates effects of scan range narrowing.

scholarly journals ANALYSIS OF THE EFFECT OF CARE DOSE 4D SOFTWARE USE ON IMAGE QUALITY AND RADIATION DOSE ON THE CT SCAN ABDOMEN

2020 ◽  
Vol 5 (1) ◽  
pp. 31-40
Author(s):  
Ni Larasati Kartika Sari ◽  
Merry Suzana ◽  
Muzilman Muslim ◽  
Dewi Muliyati
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Power Spectrum ◽  
Ct Scan ◽  
Noise Power ◽  
Exposure Control ◽  
Automatic Exposure Control ◽  
Ct Number ◽  
Still Image ◽  
Reduced Dose

The CT Scan is the most significant contributor to radiation dose on radiological examination, although the frequency of the examination is far below other modalities. In order to control this radiation dose, manufactures of CT Scan have equipped their units with built-in software called Automatic Exposure Control (AEC). This study aims to analyze the effect of AEC software, CARE Dose 4D, on image quality, and CTDIvol. Objects used in this study were three water phantoms, each with a diameter of 165 mm, 230 mm, and 305 mm. The image quality-analyzed was CT Number and noise. Measurement of image quality was carried out following Bapeten's provisions. Noise Power Spectrum (NPS) graphics were also used to further observes noise texture. The CT Number accuracy, CT Number, and noise uniformity obtained with and without CARE Dose 4D, on the three phantoms were still within Bapeten's threshold. This indicates that the use of CARE Dose 4D can still image a homogeneous object accurately. The results of the NPS curve showed that the two modes, in three phantoms, were having the same noise texture. The NPS curves also showed that the use of CARE Dose 4D produces higher noise than the non-CARE Dose 4D mode. Meanwhile, there were significant differences from the CTDIvol obtained from the two modes. The use of CARE Dose 4D software reduced dose of up to 54.34%. From this, the use of CARE Dose 4D software can reduce the radiation dose while maintaining image quality.

Reducing radiation dose in emergency computed tomography with automatic exposure control techniques

2005 ◽  
Vol 11 (5) ◽  
pp. 267-274 ◽  
Author(s):  
Mannudeep K. Kalra ◽  
Stefania M. R. Rizzo ◽  
Robert A. Novelline
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Exposure Control ◽  
Automatic Exposure Control ◽  
Control Techniques
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