Reduction of absorbed dose in storage phosphor urography by significant lowering of tube voltage and adjustment of image display parameters

2005 ◽  
Vol 46 (4) ◽  
pp. 391-395 ◽  
Author(s):  
H. J. Wiltz ◽  
U. Petersen ◽  
B. Axelsson
Keyword(s):  
Image Quality ◽  
Contrast Media ◽  
Absorbed Dose ◽  
Quality Criteria ◽  
Patient Dose ◽  
Image Display ◽  
Modified Technique ◽  
Tube Voltage ◽  
Storage Phosphor ◽  
Dose Area Product

Purpose: To investigate whether image quality in storage phosphor urography can be maintained when the X‐ray tube voltage is significantly lowered to give a lower patient dose. Material and Methods: Initial phantom studies were used to establish exposure settings at 53 kV that gave signal‐to‐noise ratios for contrast media structures equivalent to those obtained at the reference kilovoltage of 69 kV. Dose area product and image quality, assessed by image quality criteria and visual grading, were then recorded for 44 patients drawn at random to be examined by either the standard or modified technique. Results: Absorbed dose could be reduced by more than 30% without any significant change in image quality in manually controlled exposures and by 13% in exposures controlled by AEC. Conclusion: It might be possible to lower the tube voltage in digital examinations involving contrast media as a means of lowering patient dose. The image display parameters need to be adjusted to maintain image quality.

scholarly journals Correlation of image quality parameters with tube voltage in X-ray dark-field chest radiography: a phantom study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andreas P. Sauter ◽  
Jana Andrejewski ◽  
Manuela Frank ◽  
Konstantin Willer ◽  
Julia Herzen ◽  
...  
Keyword(s):  
Image Quality ◽  
Imaging Modality ◽  
Signal Strength ◽  
Dark Field ◽  
Tube Voltage ◽  
X Ray ◽  
Dose Area Product ◽  
Dark Field Imaging ◽  
Field Imaging

AbstractGrating-based X-ray dark-field imaging is a novel imaging modality with enormous technical progress during the last years. It enables the detection of microstructure impairment as in the healthy lung a strong dark-field signal is present due to the high number of air-tissue interfaces. Using the experience from setups for animal imaging, first studies with a human cadaver could be performed recently. Subsequently, the first dark-field scanner for in-vivo chest imaging of humans was developed. In the current study, the optimal tube voltage for dark-field radiography of the thorax in this setup was examined using an anthropomorphic chest phantom. Tube voltages of 50–125 kVp were used while maintaining a constant dose-area-product. The resulting dark-field and attenuation radiographs were evaluated in a reader study as well as objectively in terms of contrast-to-noise ratio and signal strength. We found that the optimum tube voltage for dark-field imaging is 70 kVp as here the most favorable combination of image quality, signal strength, and sharpness is present. At this voltage, a high image quality was perceived in the reader study also for attenuation radiographs, which should be sufficient for routine imaging. The results of this study are fundamental for upcoming patient studies with living humans.

scholarly journals Establishing a quality assurance baseline for radiological protection of patients undergoing diagnostic radiology

2011 ◽  
Vol 15 (3) ◽  
pp. 70 ◽  
Author(s):  
Geoffrey K Korir ◽  
Jeska Sidika Wambani ◽  
Ian K Korir
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Image Quality ◽  
Radiation Exposure ◽  
High Speed ◽  
Quality Criteria ◽  
Patient Dose ◽  
Radiological Protection ◽  
X Ray ◽  
High Speed Film

Background. The wide use of ionising radiation in medical care has resulted in the largest man-made cause of radiation exposure. In recent years, diagnostic departments in Kenya have adapted the high-speed film/screen combination without well-established quality control, objective image quality criteria, and assessment of patient dose. The safety of patients in terms of justification and the as-low-as-reasonably-achievable (ALARA) principle is inadequate without quality assurance measures. Aim. This study assessed the level of film rejects, device performance, image quality and patient dose in 4 representative hospitals using high-speed film/screen combination. Results. The X-ray equipment quality control tests performance range was 67% to 90%, and 63% of the radiographs were of good diagnostic value. The measured prevalent chest examination entrance surface dose (ESD) showed levels above the international diagnostic reference levels (DRLs), while lumbar spine and pelvis examination was the largest source of radiation exposure to patients. Conclusion. The optimisation of patient protection can be achieved with optimally performing X-ray equipment, the application of good radiographic technique, and continuous assessment of radiographic image quality.

CT angiography of intracranial arterial vessels: impact of tube voltage and contrast media concentration on image quality

2012 ◽  
Vol 53 (8) ◽  
pp. 929-934 ◽  
Author(s):  
Birgitta Ramgren ◽  
Isabella M Björkman-Burtscher ◽  
Stig Holtås ◽  
Roger Siemund
Keyword(s):  
Image Quality ◽  
Contrast Media ◽  
Ct Angiography ◽  
Tube Voltage ◽  
Media Concentration

scholarly journals New patient-controlled abdominal compression method in radiography: radiation dose and image quality

2018 ◽  
Vol 7 (5) ◽  
pp. 205846011877286 ◽  
Author(s):  
Oili Piippo-Huotari ◽  
Eva Norrman ◽  
Agneta Anderzén-Carlsson ◽  
Håkan Geijer
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Prone Position ◽  
Quality Criteria ◽  
Abdominal Compression ◽  
Radiographic Images ◽  
Dose Area Product ◽  
Similar Dose ◽  
Significant Difference ◽  
Area Product

Background The radiation dose for patients can be reduced with many methods and one way is to use abdominal compression. In this study, the radiation dose and image quality for a new patient-controlled compression device were compared with conventional compression and compression in the prone position . Purpose To compare radiation dose and image quality of patient-controlled compression compared with conventional and prone compression in general radiography. Material and Methods An experimental design with quantitative approach. After obtaining the approval of the ethics committee, a consecutive sample of 48 patients was examined with the standard clinical urography protocol. The radiation doses were measured as dose-area product and analyzed with a paired t-test. The image quality was evaluated by visual grading analysis. Four radiologists evaluated each image individually by scoring nine criteria modified from the European quality criteria for diagnostic radiographic images. Results There was no significant difference in radiation dose or image quality between conventional and patient-controlled compression. Prone position resulted in both higher dose and inferior image quality. Conclusion Patient-controlled compression gave similar dose levels as conventional compression and lower than prone compression. Image quality was similar with both patient-controlled and conventional compression and was judged to be better than in the prone position.

scholarly journals Pelvis imaging: Achieving dose reduction with different patient positions

2019 ◽  
Vol 34 (4) ◽  
pp. 375-383
Author(s):  
Anja Resnik ◽  
Janez Zibert ◽  
Nejc Mekis
Keyword(s):  
Image Quality ◽  
Effective Dose ◽  
Signal To Noise Ratio ◽  
Absorbed Dose ◽  
Field Size ◽  
Optimal Position ◽  
Dose Area Product ◽  
Significant Difference ◽  
Noise Ratio ◽  
Area Product

The purpose of this research was to determine how dose area product, effective dose, absorbed doses to specific organs, and image quality changed according to different automatic exposure control positions in pelvis imaging. The research was carried out in two parts. The study was conducted on an anthropomorphic phantom and 200 patients referred to pelvic imaging. We measured the dose area product, field size, height, and mass. Then we calculated the effective dose and absorbed dose for individual organs accordingly. Lateral ionizing cells were first positioned in line with the iliac crests (head towards position) and subsequently, with the femoral neck (head away position). All the images were independently evaluated by three radiologists using ViewDEX and objective image analysis was performed measuring contrast-to-noise ratio and signal-to-noise ratio. We found no significant differences in the Siemens Luminos unit in any of the inspected parameters. However, there was a significant difference in dose area product (37.3 %), effective dose (35.7 %) and average absorbed dose to selected individual organs (36.7 %) when the head away position of the patient was used and the image quality increased. Based on these results, we can propose that the optimal position of the patient regarding the ionizing cells is the head away position.

Image quality and radiation dose of low-tube-voltage CT with reduced contrast media for right adrenal vein imaging

2018 ◽  
Vol 98 ◽  
pp. 150-157 ◽  
Author(s):  
Yuki Takahashi ◽  
Hideki Ota ◽  
Kensuke Omura ◽  
Yutaka Dendo ◽  
Katharina Otani ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Contrast Media ◽  
Adrenal Vein ◽  
Tube Voltage ◽  
Low Tube Voltage ◽  
Vein Imaging

scholarly journals Screen-film versus full-field digital mammography: Radiation dose and image quality in a large teaching hospital

2013 ◽  
Vol 28 (4) ◽  
pp. 398-405
Author(s):  
Tomislav Stantic ◽  
Olivera Ciraj-Bjelac ◽  
Sanja Stojanovic ◽  
Marijana Basta-Nikolic ◽  
Danijela Arandjic ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Digital Mammography ◽  
Quality Criteria ◽  
Patient Dose ◽  
Dose Assessment ◽  
Clinical Image ◽  
Full Field ◽  
Mean Glandular Dose ◽  
Full Field Digital Mammography

The objective of this paper is to measure the radiation dose and image quality in conventional screen-film mammography and full-field digital mammography in women referred to mammography examination. Participants underwent bilateral, two-view screen-film mammography or full-field digital mammography. The visibility of anatomical regions and overall clinical image quality was rated by experienced radiologists. Total of 387 women and 1548 mammograms were enrolled in the study. Image quality was assessed in terms of image quality score, whereas patient dose assessment was performed in terms of mean glandular dose. Average mean glandular dose for cranio-caudal projection was 1.5 mGy and 2.1 mGy in full-field digital mammography and screen-film mammography, respectively. For medio-lateral oblique projection, corresponding values were 2.3 and 2.1 mGy. Overall image quality criteria scoring was 0.82 and 0.99 for screen-film and digital systems, respectively. The scores were in the range from 0.11 to 1.0 for different anatomical structures. Overall, full-field digital mammography was superior both in terms of image quality and dose over the screen-film mammography. The results have indicated that phantom dose values can assist in setting the optimisation activities in mammography and for comparison between mammography units. To obtain accurate diagnostic information with an acceptable radiation dose to breast, it is necessary to periodically perform patient dose and image quality surveys in all mammography units.

scholarly journals Automated tube voltage selection and adapted contrast media injection protocols in CT angiography of the thoracoabdominal aorta

2021 ◽  
Author(s):  
N. G. Eijsvoogel ◽  
B. M. F. Hendriks ◽  
M. Kok ◽  
B. M. E. Mees ◽  
C. Mihl ◽  
...  
Keyword(s):  
Image Quality ◽  
Contrast Media ◽  
Diagnostic Image Quality ◽  
Tube Voltage ◽  
Effective Radiation Dose ◽  
Thoracoabdominal Aorta ◽  
S 100 ◽  
Injection Protocol ◽  
Automated Tube Voltage Selection ◽  
Effective Radiation

Abstract Purpose The aim was to assess the image quality (IQ) in computed tomography angiography (CTA) of the thoracoabdominal aorta utilizing automated tube voltage selection (ATVS) with a subsequently adapted contrast media (CM) injection protocol. Materials and methods A total of 104 consecutive patients referred for CTA of the thoracoabdominal aorta were included. Scans were acquired on a 3rd-generation DSCT using ATVS with a quality reference tube voltage and current of 100 kV and 150 mAs. CM protocols were adapted to kV settings by modifying iodine delivery rate (IDR) whilst maintaining an identical injection time (13.3 s): 0.9 gI/s (70 kV), 1.0 gI/s (80 kV), 1.1 gI/s (90 kV) 1.2 gI/s (100 kV). Both objective (attenuation, contrast-to-noise and signal-to-noise) and subjective (4-point Likert scale: 1 = poor/2 = sufficient/3 = good/4 = excellent) IQ were assessed. Results ATVS assigned a 70 kV (n = 88) and 90 kV (n = 16) protocol in most patients. Fewer patients were assigned to an 80 kV (n = 4) and 100 kV (n = 1) protocol, these protocols were, therefore, excluded from further analysis. Attenuation on all designated levels of the thoracoabdominal aorta was diagnostic in 99.0% of the scans; 87/88 scans (98.9%) in the 70 kV group and in 16/16 (100%) in the 90 kV group. Overall mean attenuation was 349 ± 72HU for 70 kV and 310 ± 43HU for 90 kV. Subjective IQ was diagnostic in all scans. Overall effective radiation dose for 70 kV and 90 kV was 1.8 ± 0.2 mSv and 3.4 ± 0.7 mSv, respectively. Conclusions Adaptation of CM injection protocols (IDR) to ATVS in CTA of the aorta—scanned with 70 kV and 90 kV—is feasible and results in diagnostic image quality.

Sign in / Sign up

Export Citation Format

Share Document