scholarly journals Analisa Penerimaan Dosis Radiasi Permukaan Kulit pada Pemeriksaan Radiografi Thorax Proyeksi Postero Anterior (PA)

2015 ◽  
Vol 1 (1) ◽  
pp. 44-48
Author(s):  
Darmini Darmini ◽  
Arum Dwi Afriyani ◽  
Dwi Rochmayanti
Keyword(s):  
Radiation Dose ◽  
Quantitative Research ◽  
Patient Dose ◽  
Tube Voltage ◽  
Reference Dose ◽  
Average Value ◽  
Optimization Principle ◽  
Tube Current ◽  
Chest Examination ◽  
Analyze Data

Background:Increasing tube voltage which balanced with decreasing tube current and exposure time, it can decrease patient dose. base on optimization principle of radiation protection and radiation safety, it must be some effort in order to make patient dose minimally as it needed to get diagnostic information. The purpose of this research are to find out radiation dose on kV which usually use in Radiology Departement, radiation dose on kV with higher than usual, and two find out radiation dose acceptance on both of technique was appropriate with reference dose that set by BAPETEN.Methods : Type of this research was quantitative research with experimental approach. This research took place in laboratory 2 JTRR Semarang. This research had been done by illumination chest phantom which completed with TLD (Thermoluminisense Dosimeter) placed correct on central point on MSP (Mid Sagital Plane) as level as angulus inferior scapulae. Analyze data had been shown used  tables by average accounting, compare between acceptance radiation dose on kV which usually use in Radiology Departement and on kV with higher than usual, and compare result radiation dose with reference dose that set by BAPETEN.Results :The result of this research shown that there was difference acceptance radiation dose entrance skin on chest examination in postero-anterion projection on  tube voltage which usually use in Radiology Departement, radiation dose on  tube voltage with higher than usual. The average value of radiation dose on kV usually use in Radiology Departement was 0,059 mGy, while on tube voltage with higher than usual the average value of radiation dose was 0.020 mGy. The result of testing that used kV with higher than usual, acceptance radiation dose entrance skin which accepted was lower than on tube voltage usually use in Radiology Departement. The result of radiation dose on tube voltage usually use in Radiology Departement although used tube voltage with higher than usual, its value were lower than reference dose, it was 0,4 mGy that set by BAPETEN.Conclusion : Based on these results, using a higher tube voltage than is usually very useful to reduce the radiation dose received by the patient, then this technique should be applied in Radiology for the examination of the thorax with the PA that has a projection plane X-ray modality with high capability above 100 kV.

scholarly journals Analisis Perubahan kV dan mAs terhadap Kualitas Gambar dan Dosis Radiasi pada Pemeriksaan Multislice Computed Tomography Abdomen dalam Kasus Tumor Abdomen di Instalasi Radiologi RSUD dr. Saiful Anwar Malang

2016 ◽  
Vol 2 (1) ◽  
pp. 129-133
Author(s):  
Ardi Soesilo Wibowo ◽  
Gatot Murti Wibowo ◽  
Anang Prabowo
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Ct Scan ◽  
Quantitative Research ◽  
Scoring Method ◽  
Tube Voltage ◽  
Abdominal Tumor ◽  
Abdomen Ct ◽  
Voltage Variation

Backgroud: Examination of the abdomen CT scan is often done by using standard protocol, meanwhile the actual parameter can be modified according to local needs considering image quality and radiation dose based on Karabulut and Ariyuek (2016). Abdomen CT Scan by GE 16 slices unit in Radiology Instaallation of Dr. Saiful Anwar Malang Hospital, using exposure factor of 120 kV, 234 mAs and the value of the CTDI dose was 53.04 mGy. While the BAPETEN’s reference of CTDI value, a CT scan of abdomen was 25 mGy.  This study aims to determine the changes of the value of kV and mAs to the image quality and the radiaton dose in the abdomen MSCT examination on abdominal tumor case in Radiology Installation of Dr. Saiful Anwar Malang Hospital.Methods: This research was a quantitative research with an experimental approach. The data were collected from three variations of tube voltage (kV) ie 100 kV, 120 kV and 140 kV and three variations of tube current value and time (mAs) ie, 180 mAs, 195 mAs, and 210 mAs. Radiographs was evaluated by three radiology physicians. Data were analyzed by scoring method of respondent’s assessment to assess MSCT image quality of abdominal tumor, while the radiation dose was obtained by CTDI recording.Results: The results showed that there was influence of tube voltage variation to image quality of abdominal tumor using MSCT unit. The higher kV used, the higher image quality resulted. From the calculation of the percentage from the assessment, the highest score of variation was at 140 kV, while the lowest score of variation was at 100 kV. Based on the recording CTDI radiation dose on the monitor, found that the higher value of kV, the higher radiation resulted. The mAs variations influenced the image quality of abdominal tumor using MSCT unit. Acoording to the percentage of the assessment, the highest score of variation found in 210 mAs, and the lowest score of variation found in 180 mAs. Based on the recording of radiation dose on the monitor, the higher mAs value, the higher radiation dose using MSCT unit. It was recommended to use 195 kV and 120 mAs for MSCT examination of abdominal tumor in Radiology Installation of Dr. Saiful Anwar Malang Hospital.Conclusion: There was influence of kV and mAs variation to anatomical image clarity and radiation dose of abdomen MSCT examination

scholarly journals Studies on the radiation dose, image quality and low contrast detectability from MSCT abdomen by using low tube voltage

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
A. Mokhtar ◽  
Z. A. Aabdelbary ◽  
A. Sarhan ◽  
H. M. Gad ◽  
M. T. Ahmed
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Statistical Significance ◽  
Image Noise ◽  
Tube Voltage ◽  
Current Time ◽  
Low Contrast ◽  
Low Tube Voltage ◽  
Tube Current ◽  
Noise Ratio

Abstract Background To study radiation dose, image quality and low-contrast cylinder detectability from multislice CT (MSCT) abdomen by using low tube voltage using the American College of Radiology (ACR) phantom. The ACR phantom (low-contrast module) was scanned with 64 MSCT scanner (Brilliance, Philips Medical System, Eindhoven, Netherlands) with 80 and 120 KVP, utilizing different tube current time product (mAs) range from 50 to 380 mAs. The image noise (SD), signal to noise ratio, contrast-to-noise ratio (CNR), and scores of low contrast detectability were assessed for every image respectively. Results From images analyses, the noise essentially increased with the use of low tube voltage. The CNR was 0.94 ± 0.27 at 120 KVP, and CNR was 0.43 ± 0.22 at 80 KVP. However, with the same dose, there were no differences of statistical significance in scores of low-contrast detectability between 120 KVP at 300mAs and 80 KVP at (200–380) mAs (p > 0.05). At 300 mAs, the CTDIvol obtained at 80 KVP was about 29% of that at 120 KVP. The CTDIvol obtained at 80 KVP were decreased from 5% at 50 mAs, to 37% at 380 mAs. Conclusions There is a possibility to decrease exposure of radiation virtually by reducing KVP from 120 to 80 KVP in examination of abdominal CT when the high tube current is used, though increasing image noise at low tube voltage.

scholarly journals Use of Multi-Modality Technology to Reduce the Radiation Dose of Multi-Slice Spiral CT Coronary Angiography (MSCTCA) in Normal Weight and Overweight Patients

2021 ◽  
Author(s):  
Xiao lu Hu ◽  
Pei kai Huang ◽  
Meng Zhang ◽  
Min Lei ◽  
Jun Chen ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Signal To Noise Ratio ◽  
Normal Weight ◽  
Current Control ◽  
Tube Voltage ◽  
Tube Current ◽  
Overweight Group ◽  
Group A ◽  
Iq Scores ◽  
Group B

Abstract Purpose: This study was performed to explore the value of multi-modality technology, with a combination of narrow acquisition window, isocentric scanning, low tube voltage, low tube current and iterative reconstruction (IR), for reducing the radiation dose in multi-slice spiral computed tomography coronary angiography (MSCTCA). Materials and methods: In this prospective randomised controlled study, 154 patients with coronary heart disease (CHD) were classified according to body mass index (BMI) as normal weight (BMI 18–27kg/m2) or overweight (BMI ≥ 27 kg/m2), and divided into four groups: multi-modality–normal BMI group (A1, n = 82); multi-modality–overweight group (B1, n = 17); conventional–normal BMI group (A2, n = 39); and conventional–overweight group (B2, n = 16). The parameters in the multi-modality groups were as follows: isocentric scan, tube voltage = 80 kV, tube current control using 80% “smart milliampere”, and maximum current during 60–80% of the RR interval. The parameters in the conventional groups were as follows: normal position, tube voltage = 100 kV, tube current control using smart milliampere, and maximum current during 30–80% of the RR interval. The effective radiation dose (ED), objective image quality (IQ), noise, signal-to-noise ratio (SNR), contrast signal-to-noise ratio (CNR) and subjective 5-point Likert scale IQ scores of MSCTCA images were compared among the four groups. Results: The average EDs of groups A1, A2, B1and B2 were( 1.13±0.35 ) mSv, ( 3.36±1.30 ) mSv, ( 1.54±0.53 ) mSv and ( 5.90±0.93 ) mSv, respectively. There were statistically significant differences in ED between groups A1 and A2, and between groups B1 and B2 (all P < 0.01). Noise was significantly lower, and both SNR and CNR were significantly higher, in group A2 than group A1 (all P < 0.01), but there were no significant differences in these parameters between groups B1 and B2 (P = 0.14–0.51). The average IQ scores of groups A1, A2, B1and B2 were 4.46±0.59(Fig.3), 4.45±0.62(Fig.4), 4.39±0.68(Fig.5) and 4.42±0.66(Fig.6),respectively. There were no significant differences in subjective IQ scores among the four groups (P = 0.12). Consistency among observers in the subjective IQ scores of the four groups was very good, with intraclass correlation coefficients (ICCs) of 0.71–0.90. The subjective IQ scores of the coronary artery were excellent in all four groups, with a total good-to-excellent rate of ≥ 92.64%, and the total number of evaluable segments in the images of all four groups was ≥ 98.26%. Conclusions: Under conditions appropriate for clinical diagnosis, multi-modality technology can reduce the radiation dose of MSCTCA scans in both normal weight and overweight patients.

RADIATION DOSE DISTRIBUTION OF A PLAIN RADIOGRAPHY ROOM AND COMPUTED TOMOGRAPHY ROOM IN A VETERINARY HOSPITAL

2019 ◽  
Vol 187 (2) ◽  
pp. 243-248
Author(s):  
Kuan-Sheng Chen ◽  
Ying-Hsiang Chou ◽  
Ruey-Shyuan Wu ◽  
Wei-Ming Lee ◽  
Yeu-Sheng Tyan ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Radiation Safety ◽  
Plain Radiography ◽  
Dose Limit ◽  
Tube Voltage ◽  
Current Time ◽  
Tube Current ◽  
Control Rooms ◽  
Veterinary Hospital

Abstract Thermoluminescent dosemeters (TLDs) were attached to the walls of a plain radiography room and a computed tomography (CT) room, control rooms and corridors to measure the radiation dose. The types of animals scanned and scan parameters were analysed. Dogs and cats accounted for the largest proportion of animals, a combined total of 96.0%. Distributions of tube voltage and tube current-time product are presented. In the CT room, the dose at the angle of the gantry opening was higher than that on either side of the gantry. The study developed equations that may be useful to assess the dose for staff standing in radiography rooms. The personal annual doses for the controlled and uncontrolled areas were lower than the recommended dose limit. The annual doses for personnel and nonworkers were also within the acceptable level for radiation safety.

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