scholarly journals High-Pitch Computed Tomography Coronary Angiography—A New Dose-Saving Algorithm: Estimation of Radiation Exposure

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Dominik Ketelsen ◽  
Markus Buchgeister ◽  
Andreas Korn ◽  
Michael Fenchel ◽  
Bernhard Schmidt ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Effective Dose ◽  
Whole Body ◽  
High Pitch ◽  
Thermoluminescent Dosimeters ◽  
Tube Potential ◽  
Dose Saving ◽  
Dual Source ◽  
Males And Females ◽  
Female Specific

Purpose. To estimate effective dose and organ equivalent doses of prospective ECG-triggered high-pitch CTCA.Materials and Methods. For dose measurements, an Alderson-Rando phantom equipped with thermoluminescent dosimeters was used. The effective dose was calculated according to ICRP 103. Exposure was performed on a second-generation dual-source scanner (SOMATOM Definition Flash, Siemens Medical Solutions, Germany). The following scan parameters were used: 320 mAs per rotation, 100 and 120 kV, pitch 3.4 for prospectively ECG-triggered high-pitch CTCA, scan range of 13.5 cm, collimation  mm with z-flying focal spot, gantry rotation time 280 ms, and simulated heart rate of 60 beats per minute.Results. Depending on the applied tube potential, the effective whole-body dose of the cardiac scan ranged from 1.1 mSv to 1.6 mSv and from 1.2 to 1.8 mSv for males and females, respectively. The radiosensitive breast tissue in the range of the primary beam caused an increased female-specific effective dose of % compared to males. Decreasing the tube potential, a significant reduction of the effective dose of 35.8% and 36.0% can be achieved for males and females, respectively ().Conclusion. The radiologist and the CT technician should be aware of this new dose-saving strategy to keep the radiation exposure as low as reasonablly achievable.

scholarly journals Whole Body Low Dose Computed Tomography Using Third-Generation Dual-Source Multidetector With Spectral Shaping: Protocol Optimization and Literature Review

Dose-Response ◽  
2020 ◽  
Vol 18 (4) ◽  
pp. 155932582097313
Author(s):  
Dario Baldi ◽  
Liberatore Tramontano ◽  
Vincenzo Alfano ◽  
Bruna Punzo ◽  
Carlo Cavaliere ◽  
...  
Keyword(s):  
Effective Dose ◽  
Low Dose ◽  
Whole Body ◽  
Dose Length Product ◽  
Osteolytic Lesions ◽  
Subjective Image Quality ◽  
Ct Dose ◽  
Dual Source ◽  
Ct Dose Index ◽  
Low Dose Computed Tomography

For decades, the main imaging tool for multiple myeloma (MM) patient’s management has been the conventional skeleton survey. In 2014 international myeloma working group defined the advantages of the whole-body low dose computed tomography (WBLDCT) as a gold standard, among imaging modalities, for bone disease assessment and subsequently implemented this technique in the MM diagnostic workflow. The aim of this study is to investigate, in a group of 30 patients with a new diagnosis of MM, the radiation dose (CT dose index, dose-length product, effective dose), the subjective image quality score and osseous/extra-osseous findings rate with a modified WBLDCT protocol. Spectral shaping and third-generation dual-source multidetector CT scanner was used for the assessment of osteolytic lesions due to MM, and the dose exposure was compared with the literature findings reported until 2020. Mean radiation dose parameters were reported as follows: CT dose index 0.3 ± 0.1 mGy, Dose-Length Product 52.0 ± 22.5 mGy*cm, effective dose 0.44 ± 0.19 mSv. Subjective image quality was good/excellent in all subjects. 11/30 patients showed osteolytic lesions, with a percentage of extra-osseous findings detected in 9/30 patients. Our data confirmed the advantages of WBLDCT in the diagnosis of patients with MM, reporting an effective dose for our protocol as the lowest among previous literature findings.

scholarly journals DIAGNOSTIC IMAGING AND IONIZING RADIATION EXPOSURE IN A LEVEL 1 TRAUMA CENTRE POPULATION MET WITH TRAUMA TEAM ACTIVATION: A ONE-YEAR PATIENT RECORD AUDIT

2020 ◽  
Vol 189 (1) ◽  
pp. 35-47
Author(s):  
Anna Bågenholm ◽  
Pål Løvhaugen ◽  
Rune Sundset ◽  
Tor Ingebrigtsen
Keyword(s):  
Diagnostic Imaging ◽  
Radiation Exposure ◽  
Effective Dose ◽  
Trauma Team ◽  
Trauma Centre ◽  
Whole Body ◽  
Reference Level ◽  
Dose Length Product ◽  
Trauma Team Activation ◽  
X Ray

Abstract This audit describes ionizing and non-ionizing diagnostic imaging at a regional trauma centre. All 144 patients (males 79.2%, median age 31 years) met with trauma team activation from 1 January 2015 to 31 December 2015 were included. We used data from electronic health records to identify all diagnostic imaging and report radiation exposure as dose area product (DAP) for conventional radiography (X-ray) and dose length product (DLP) and effective dose for CT. During hospitalization, 134 (93.1%) underwent X-ray, 122 (84.7%) CT, 92 (63.9%) focused assessment with sonography for trauma (FAST), 14 (9.7%) ultrasound (FAST excluded) and 32 (22.2%) magnetic resonance imaging. One hundred and sixteen (80.5%) underwent CT examinations during trauma admissions, and 73 of 144 (50.7%) standardized whole body CT (SWBCT). DAP values were below national reference levels. Median DLP and effective dose were 2396 mGycm and 20.42 mSv for all CT examinations, and 2461 mGycm (national diagnostic reference level 2400) and 22.29 mSv for a SWBCT.

Radiation exposure and establishment of diagnostic reference levels of whole-body low-dose CT for the assessment of multiple myeloma with second- and third-generation dual-source CT

2021 ◽  
pp. 028418512110032
Author(s):  
Sebastian Zensen ◽  
Denise Bos ◽  
Marcel Opitz ◽  
Johannes Haubold ◽  
Michael Forsting ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Low Dose ◽  
Whole Body ◽  
Third Generation ◽  
Dual Source Ct ◽  
Diagnostic Reference Levels ◽  
Reference Levels ◽  
Organ Doses ◽  
Dual Source ◽  
Effective Doses

Background In the assessment of diseases causing skeletal lesions such as multiple myeloma (MM), whole-body low-dose computed tomography (WBLDCT) is a sensitive diagnostic imaging modality, which has the potential to replace the conventional radiographic survey. Purpose To optimize radiation protection and examine radiation exposure, and effective and organ doses of WBLDCT using different modern dual-source CT (DSCT) devices, and to establish local diagnostic reference levels (DRL). Material and Methods In this retrospective study, 281 WBLDCT scans of 232 patients performed between January 2017 and April 2020 either on a second- (A) or third-generation (B) DSCT device could be included. Radiation exposure indices and organ and effective doses were calculated using a commercially available automated dose-tracking software based on Monte-Carlo simulation techniques. Results The radiation exposure indices and effective doses were distributed as follows (median, interquartile range): (A) second-generation DSCT: volume-weighted CT dose index (CTDIvol) 1.78 mGy (1.47–2.17 mGy); dose length product (DLP) 282.8 mGy·cm (224.6–319.4 mGy·cm), effective dose (ED) 1.87 mSv (1.61–2.17 mSv) and (B) third-generation DSCT: CTDIvol 0.56 mGy (0.47–0.67 mGy), DLP 92.0 mGy·cm (73.7–107.6 mGy·cm), ED 0.61 mSv (0.52–0.69 mSv). Radiation exposure indices and effective and organ doses were significantly lower with third-generation DSCT ( P < 0.001). Local DRLs could be set for CTDIvol at 0.75 mGy and DLP at 120 mGy·cm. Conclusion Third-generation DSCT requires significantly lower radiation dose for WBLDCT than second-generation DSCT and has an effective dose below reported doses for radiographic skeletal surveys. To ensure radiation protection, DRLs regarding WBLDCT are required, where our locally determined values may help as benchmarks.

Radiation exposure of patients undergoing whole-body FDG-PET/CT examinations

2014 ◽  
Vol 53 (05) ◽  
pp. 217-220 ◽  
Author(s):  
D. Noßke ◽  
U. Leche ◽  
G. Brix
Keyword(s):  
Radiation Exposure ◽  
Effective Dose ◽  
Fdg Pet ◽  
Radiation Risk ◽  
Whole Body ◽  
Organ Doses ◽  
Weighting Factors ◽  
Pet Ct ◽  
Conversion Coefficients ◽  
Fdg Pet Ct

SummaryAim: Reinvestigation of the radiation exposure of patients undergoing whole-body [18F]FDG-PET/CT examinations pursuant to the revised recommendations of the ICRP. Methods: Conversion coefficients for equivalent organ doses were determined for realistic anthropomorphic phantoms of reference persons. Based on these data, conversion coefficients for the effective dose were calculated using the revised tissue-weighting factors that account for the different radiation susceptibilities of organs and tissues, and the redefinition of the group ‘remainder tissues’. Results: Despite the markedly changed values of the equivalent organ doses estimated for FDG and of the tissue-weighting factors, the conversion coefficient for the effective dose resulting from FDG administration decreases only slightly by 10 %. For whole-body CT scans it remains even unchanged. Conclusion: The updated dose coefficients provide a valuable tool to easily assess the generic radiation risk of patients undergoing whole- body PET/CT (or PET/MRI) examinations and can be used, amongst others, for protocol optimization.

Radiation exposure to the patient caused by single-photon transmission measurement for 3D whole-body PET

2000 ◽  
Vol 39 (07) ◽  
pp. 204-208 ◽  
Author(s):  
H. Seifert ◽  
P. Donsch ◽  
C.-M. Kirsch ◽  
A. Schaefer
Keyword(s):  
Radiation Exposure ◽  
Effective Dose ◽  
Single Photon ◽  
Point Sources ◽  
Whole Body ◽  
Acquisition Time ◽  
Transmission Measurement ◽  
Emission Measurement ◽  
A Value ◽  
Transmission Scan

Summary Aim: The aim of the study was the determination of the radiation exposure to the patient caused by singlephoton transmission mesasurement for 3D whole-body PET. Material and Method: Single-photon-transmission measurement is performed using two Cs-137 pointsources (Eγ = 662 keV, A = 2*614 MBq) on a 3D PET scanner (ECAT ART). During a simulation of a whole body transmission scan (axial length: 75 cm, 6 contigous bed positions) dose measurements with thermoluminescent dosimeters were carried out using a thorax and an abdomen phantom. Following the guidelines of the ICRU report No. 60 an estimation of the effective dose caused by a single-photon transmission measurement was calculated. Results: For a total acquisition time of 360 min (6 beds with an acquisition time of 60 min per bed) the absorbed doses amounted to: surface (xyphoid) 189 μGy, heart 196 μGy, lungs 234 μGy, vertebra 240 μGy, liver 204 μGy, gonads 205 μGy, thyroid 249 μGy and bladder 185 μGy resulting in a conversion factor of 1.7*10–4 mSv/( h*MBq). The estimation of the effective dose for a patient’s transmission (acquisition time of 3.2 min per bed) yields a value of 11 μSv. An estimation of the ratio of the conversion factors for transmission measurements in single-photonand in coincidence mode (two Ge-68/Ga-68 rod sources of 40 MBq each), respectively, resulted in a value of 0.18. The comparison of the effective doses caused by single-photon transmission and by emission measurement (injection of 250 MBq of FDG) yields a ratio of 2.3*10–3. Conclusion: The radiation exposure of the patient caused by the transmission measurement for 3D whole-body-PET can be neglected. In comparison with the coincidence-transmission using uncollimated line sources of low activity the radiation exposure is still reduced using single photon transmission with collimated point sources of high activity.

ECG-gated Versus Non-ECG-gated High-pitch Dual-source CT for Whole Body CT Angiography (CTA)

2016 ◽  
Vol 23 (2) ◽  
pp. 163-167 ◽  
Author(s):  
Martin Beeres ◽  
Julian L. Wichmann ◽  
Claudia Frellesen ◽  
Andreas M. Bucher ◽  
Moritz Albrecht ◽  
...  
Keyword(s):  
Ct Angiography ◽  
Whole Body ◽  
Dual Source Ct ◽  
High Pitch ◽  
Whole Body Ct ◽  
Dual Source ◽  
Body Ct

scholarly journals Occupational Radiation Exposure to Workers Used18F-FDG

2019 ◽  
Vol 29 (4) ◽  
pp. 100
Author(s):  
Ahmed Ali Wabdan
Keyword(s):  
Radiation Exposure ◽  
Radiation Risk ◽  
Whole Body ◽  
Thermoluminescent Dosimeters ◽  
Medical Physicist ◽  
Positron Emission ◽  
Pet Ct ◽  
Medical Physicists ◽  
The Mean ◽  
18F Fdg

The increasing interest of medical institutes in the development of imaging services to include the hybrid system [Positron Emission Tomography combined with Computed Tomography(PET/CT)], this system is acquiring explosive growth due to its ability to accurately detect and stage many types of cancer and follow the progress of treatments. An increasing demand for use of (18F-FDG PET) in oncology has been the main reason for its growth. The physical characteristics of positron emissions result in higher radiation risk for staff and growing use of PET/CT for diagnostic purposes increase radiation exposure. The objective of this study was to estimate the radiation exposure to the medical physicists, technicians and nurses working in three Egyptian nuclear medicine institutes under our investigations, based on the whole body collective dose measured by thermoluminescent dosimeters (TLDs) and the effective dose per study received by medical staff were measured by electronic pocked dosimeters and the finger doses by ring dosimeter during a period of six months. The (mean± SD) dose measured per PET/CT procedure were (2.45±0.137, 3.22±0.218 and 1.69±0.11) μSv for the medical physicist, technician and nurse respectively. The (mean± SD) dose measured per MBq of 18F-FDG were (7.35±0.43, 9.73±0.66 and 5.13±0.33) nSv/MBq for the medical physicist, technician and nurse respectively. The (mean± SD) finger dose measured per 18F-FDGPET/CT scans were (179.9±24.94, 8.82±2.912 and 24.15±4.164) μSv for the medical physicist, technician and nurse respectively.

Sign in / Sign up

Export Citation Format

Share Document