scholarly journals Patient Dose Estimation from Digital Radiography Repeat Rate

2020 ◽  
Author(s):  
Gholamreza Fallah Mohammadi ◽  
Yasaman Kiumarsi ◽  
Pardis Eghbaliyan
Keyword(s):  
Effective Dose ◽  
Digital Radiography ◽  
Cumulative Dose ◽  
Radiographic Examination ◽  
Annual Number ◽  
Skin Dose ◽  
Annual Dose ◽  
X Ray ◽  
Total Percentage ◽  
Repeat Rate

Purpose: This research aimed at estimating the patient effective dose from digital radiography repeat rateand evaluating the factors that contribute to the repetition of radiographic procedures in two referral hospitals in Sari, Iran. Materials and Methods: Entrance skin dose and effective dose per common radiography procedures in digital radiography were measured. 1724 X-ray exposures were investigated prospectively. The annual number of each radiography procedure was obtained from the archives of the digital radiography department. The patient cumulative dose was the calculation from annual exposures Repeat Rate (RR) and effective dose per digital radiography procedures. Results: The mean exposure RR per examination was 1.12% and the total percentage of a repeat of all examination was 8.9%. Annual cumulative dose (man-mSivert) resulted from radiographic RR was 449.2.The chest and lumbar spine radiography had the highest annual number and the highest radiation dose, respectively; therefore, these procedures transfer the largest annual dose from repeated radiographic images to the patients. The factors leading to the repetition included the radiographer error (69%), the X-ray tube and equipment error (10.4%), the patient related error (16.1%) and other cases (4.1%). The average effective dose for each examination was 0.36 mSv. Conclusion: Digital radiographic repeat rate increases a 1.1 % annual patient effective dose from the base level that receives from the current radiographic examination. Inconsistency of the center of the digital panel and the central axis of the X-ray beam and error in the selection of the upright or table digital panel are among the most important factors in the repetition of digital radiography.  

scholarly journals Measurement of Entrance Skin Dose and Calculation of Effective Dose for Common Diagnostic X-Ray Examinations in Kashan, Iran

2015 ◽  
Vol 7 (5) ◽  
Author(s):  
Akbar Aliasgharzadeh ◽  
Ehsan Mihandoost ◽  
Mahboubeh Masoumbeigi ◽  
Morteza Salimian ◽  
Mehran Mohseni
Keyword(s):  
Effective Dose ◽  
Skin Dose ◽  
X Ray ◽  
Entrance Skin Dose

scholarly journals Dental images - Their use and abuse

2020 ◽  
Vol 75 (10) ◽  
pp. 584-590
Author(s):  
Leanne M Sykes ◽  
A Uys ◽  
C Bradfield ◽  
Nicolaas W Van Reede Van Oudtshoorn
Keyword(s):  
Image Quality ◽  
Effective Dose ◽  
Digital Imaging ◽  
Radiation Dosage ◽  
Radiographic Examination ◽  
Trade Off ◽  
X Ray ◽  
Therapeutic Benefits ◽  
Alternative Techniques ◽  
The Individual

Patients' exposure to medical and dental radiographic examination has increased over the years,1 with dental X-ray procedures now accounting for almost one-third of all radiographic examinations.2 Although they only contribute 2-4% towards the collective effective dose of exposure, all efforts should be made to minimize the amount taken and to keep exposure as low as diagnostically achievable.2 When considering radiographic examinations, the potential diagnostic or therapeutic benefits to the individual or society need to be weighed up against the possible risks that the exposure may cause, taking into account the "efficacy, and benefits and risks of alternative techniques that have the same objectives but involve no or less radiation".2,3 To this end the acronym ALARA was coined to stress that all diagnostic radiographs should aim to keep doses as low as reasonably achievable without compromising the diagnosis.1 With the advent of digital imaging there has been a trade-off between image quality and reduced radiation dosage. As such the term has been altered to ALADA, as low as diagnostically acceptable, to reflect this compromise.2

scholarly journals COMPARISON OF SURFACE RADIATION DOSE TO THE GONADS BY RADIOGRAPHIC EXAMINATION OF THE LUMBAR SPINE USING COMPUTED RADIOGRAPHY AND DIRECT DIGITAL RADIOGRAPHY

2017 ◽  
Vol 10 (12) ◽  
pp. 52
Author(s):  
Priyanka Priyanka ◽  
Rahul P Kotian ◽  
Nitika C Panakkal
Keyword(s):  
Lumbar Spine ◽  
Digital Radiography ◽  
Computed Radiography ◽  
Surface Radiation ◽  
Radiographic Examination ◽  
X Ray ◽  
The Social ◽  
Significant Difference ◽  
Males And Females ◽  
Number Of Males

Objectives: The objectives are aimed to study the comparison of SRD to the gonads by radiographic examination of the lumbar spine using computed radiography (CR) and direct digital radiography (DR) and to evaluate dose differences according to gender.Methods: A total of 120 subjects with an equal number of males and females referred for lumbar spine anteroposterior (AP) and lateral was included in the study. Sixty patients had undergone X-ray in CR X-ray unit and 60 in DR X-ray unit. SRD to gonads from a radiographic examination of the lumbar spine was measured in CR and DR using Mult-O-Meter, and obtained value of SRD was in μGy. Statistical analysis was performed using Statistical Package for the Social Sciences. Data were represented as a median and interquartile range. Mann–Whitney U-test was used for the comparison of SRD to gonads. Two-way analysis of variance (ANOVA) test was used to find out the statistically significant difference in SRD to the gonads according to gender from radiography of lumbar spine taken using CR and direct DR.Results: There was a statistically significant difference in SRD to gonads from radiography of lumbar spine AP and lateral taken using CR and direct DR (p<0.001). There was no statistically significant difference in SRD to the gonads in males and females from radiography of lumbar spine AP (p=0.577) and lateral (p=0.164) taken using CR and direct DR.Conclusion: It was found that SRD to gonads from lumbar spine AP was 54% lower in direct DR and SRD to gonads from lumbar spine lateral was 68% lower in direct DR than CR.

Radiation exposure of patients undergoing nuclear medicine procedures in Germany between 1996 and 2000

2005 ◽  
Vol 44 (05) ◽  
pp. 119-130 ◽  
Author(s):  
P. Schnell-Inderst ◽  
D. Noßke ◽  
M. Weiss ◽  
A. Stamm-Meyer ◽  
G. Brix ◽  
...  
Keyword(s):  
Nuclear Medicine ◽  
Cardiovascular System ◽  
Effective Dose ◽  
Current Status ◽  
Annual Number ◽  
Statistical Parameters ◽  
Public Health Information ◽  
Nuclear Medicine Procedures ◽  
And Gender ◽  
Icrp Publication

Summary:The aim of this study was to estimate both the frequency and effective dose of nuclear medicine procedures performed in Germany between 1996 and 2000 for different subgroups of patients. Methods: Electronically archived data from 14 hospitals and 10 private practices were restored and statistically analyzed. The effective dose per examination was calculated according to ICRP publication 80 using the tissue weighting factors given in ICRP publication 60. Based on the data collected, statistical parameters were computed to characterize the frequency and effective dose of the various nuclear medicine procedures. Results: In total, 604,771 nuclear medicine procedures performed in 433,709 patients were analyzed. On average, 1.4 examinations were carried out per patient and year. The median effective dose was 1.7 [5.-95. percentile; mean: 0.4–8.5; 2.9] mSv per examination and 2.3 [0.5–11.2; 3.5] mSv per patient. Interestingly, the mean effective dose per examination, but not the number of examinations per year increased with the age of the patients. Most frequent were examinations of the thyroid (36.7%), the skeleton (27.1%) and the cardiovascular system (11.1%), which were associated with a median effective dose of 0.5 [0.5–1.1; 0.7] mSv, 3.4 [2.9–5.1; 3.6] mSv and 7.3 [3.2–21.0; 9.5] mSv, respectively. Over the five-year period examined, the total annual number of PET procedures (222.3%) as well as of examinations of thyroid (24.5%), skeleton (17.9%), and the cardiovascular system (14.9%) increased markedly, whereas a decrease was observed for brain (-39.3%), lung (-20.2%) and renal (-15.0%) scans. Conclusion: The age- and gender-specific data presented in this study provide detailed public health information on both the current status and recent trends in the practice of diagnostic nuclear medicine examinations.

Development of a novel direct X-ray detector using photoinduced discharge (PID) readout for digital radiography

2013 ◽  
Vol 8 (02) ◽  
pp. C02045-C02045
Author(s):  
D Heo ◽  
S Jeon ◽  
J -S Kim ◽  
R K Kim ◽  
B K Cha ◽  
...  
Keyword(s):  
Digital Radiography ◽  
X Ray

Using 100- instead of 120-kVp computed tomography to diagnose pulmonary embolism almost halves the radiation dose with preserved diagnostic quality

2010 ◽  
Vol 51 (3) ◽  
pp. 260-270 ◽  
Author(s):  
Peter Björkdahl ◽  
Ulf Nyman
Keyword(s):  
Computed Tomography ◽  
Pulmonary Embolism ◽  
Image Quality ◽  
Radiation Dose ◽  
Effective Dose ◽  
Ct Number ◽  
Subjective Image Quality ◽  
Diagnostic Quality ◽  
X Ray ◽  
Tube Potential

Background: Concern has been raised regarding the mounting collective radiation doses from computed tomography (CT), increasing the risk of radiation-induced cancers in exposed populations. Purpose: To compare radiation dose and image quality in a chest phantom and in patients for the diagnosis of pulmonary embolism (PE) at 100 and 120 peak kilovoltage (kVp) using 16-multichannel detector computed tomography (MDCT). Material and Methods: A 20-ml syringe containing 12 mg I/ml was scanned in a chest phantom at 100/120 kVp and 25 milliampere seconds (mAs). Consecutive patients underwent 100 kVp ( n = 50) and 120 kVp ( n = 50) 16-MDCT using a “quality reference” effective mAs of 100, 300 mg I/kg, and a 12-s injection duration. Attenuation (CT number), image noise (1 standard deviation), and contrast-to-noise ratio (CNR; fresh clot = 70 HU) of the contrast medium syringe and pulmonary arteries were evaluated on 3-mm-thick slices. Subjective image quality was assessed. Computed tomography dose index (CTDIvol) and dose–length product (DLP) were presented by the CT software, and effective dose was estimated. Results: Mean values in the chest phantom and patients changed as follows when X-ray tube potential decreased from 120 to 100 kVp: attenuation +23% and +40%, noise +38% and +48%, CNR −6% and 0%, and CTDIvol −38% and −40%, respectively. Mean DLP and effective dose in the patients decreased by 42% and 45%, respectively. Subjective image quality was excellent or adequate in 49/48 patients at 100/120 kVp. No patient with a negative CT had any thromboembolism diagnosed during 3-month follow-up. Conclusion: By reducing X-ray tube potential from 120 to 100 kVp, while keeping all other scanning parameters unchanged, the radiation dose to the patient may be almost halved without deterioration of diagnostic quality, which may be of particular benefit in young individuals.

A review of radiation doses and associated parameters in western australian mining operations (2018-20)

2021 ◽  
Author(s):  
Martin Ian Ralph ◽  
Marcus Cattani
Keyword(s):  
Effective Dose ◽  
Annual Reports ◽  
Radiological Protection ◽  
Annual Dose ◽  
Mining Operations ◽  
Decay Series ◽  
Dose Coefficients ◽  
The Mean ◽  
Institutional Controls ◽  
First Time

Abstract In the 2019-20 reporting period, nineteen mining operations in Western Australia were identified as having workers who were likely to be exposed to ionising radiation stemming from naturally occurring radioactive materials (NORMs), seventeen of which, known hereinafter as Reporting Entities (REs), were required to submit an annual report of the dose estimates of their workforce to the mining regulatory authority. In 2018 the International Commission for Radiological Protection published the revision of the Dose Coefficients (DCs) for occupational intakes of radionuclides of the uranium-238 and thorium-232 decay series, in ICRP-137 and ICRP-141. The 2019-20 annual reports are the first to apply the revised DCs to estimate worker doses. The mean effective dose (ED) reported by the 17 REs increased by 32.4% to 0.94 mSv in 2019-20 from 0.71 mSv reported in 2018-19, indicating that the mean ED is approaching the 1 mSv annual dose estimate at which regulatory intervention should be considered. The mean committed effective dose (CED) from inhalation of dusts containing long-lived alpha-emitting (LLα) nuclides has increased by 35% from 0.40 mSv in 2018-19 to 0.54 mSv in 2019-20. The maximum CED from LLα increased by 16.3% from 3.20 mSv in 2018-19 to 3.72 mSv in 2019-20. The authors consider that, in the absence of other explanations provided by the REs, the increase is largely attributable to the revised DC’s published in ICRP-137 and ICRP-141, but highlight that there are significant variations between REs that make a generalised conclusion problematic. The maximum reported ED in 2019-20 was 6.0 mSv, an increase of 36.4% from 2018-19 (4.4 mSv). The 2019-20 reporting period is the first time in a decade in which mine worker EDs have been elevated to the point that EDs have exceeded 5 mSv, a level at which personal monitoring and additional institutional controls are required.

Przewlekły kaszel jako główna manifestacja chłoniaka Hodgkina – opis przypadku

2019 ◽  
Vol 23 (3) ◽  
Author(s):  
Katarzyna Wójcicka ◽  
Andrzej Pogorzelski
Keyword(s):  
Chronic Cough ◽  
Correct Diagnosis ◽  
Diagnostic Methods ◽  
Radiographic Examination ◽  
Older Children ◽  
X Ray ◽  
Volume Curve ◽  
Flow Volume Curve ◽  
Mediastinal Widening ◽  
Chest X Ray

A cough lasting longer than 4-8 weeks, defined as chronic cough, always requires thorough diagnostic evaluation. In addition to detailed history-taking and physical examination, simple and available diagnostic methods, such as chest x-ray and spirometry, should be performed. They may be helpful tool to establish the underlying cause of cough. Many younger children may have difficulties in performing the forced expiratory maneuvers and fulfilling repeatability criteria for spirometry. The disturbances resulting from insufficient cooperation should be considered in interpratation of the obtained results. The shape of the flow-volume curve, which suggests upper or central airways obstruction, can not be ignored and always requires further investigation for diagnosis of respiratory pathology. The chest x-ray is the most frequently performed radiographic examination in children. Accurate interpretation is essential in reaching a correct diagnosis. Mediastinal widening on the chest x-ray in children can occur due to a large variety of causes. The normal thymus can take on a variety of sizes and shapes and still be considered normal in the first few years of life. In older children mediastinal widening should be differentiated from mediastinal masses. Lymph node enlargement represents a frequent cause, usually as a result of infection or malignancy. The article reports a case of a 12-year-old boy with chronic cough, mediastinal widening on the chest X-ray and abnormal spirometry results, who was finally diagnosed with stage III Hodgkin’s lymphoma.

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