scholarly journals Proper Management of the Clinical Exposure Index Based on Body Thickness Using Dose Optimization Tools in Digital Chest Radiography: A Phantom Study

2021 ◽  
Vol 18 (10) ◽  
pp. 5203
Author(s):  
Yongsu Yoon ◽  
Hyemin Park ◽  
Jungmin Kim ◽  
Jungsu Kim ◽  
Younghoon Roh ◽  
...  
Keyword(s):  
Digital Radiography ◽  
Chest Radiography ◽  
Exposure Dose ◽  
Dose Optimization ◽  
International Electrotechnical Commission ◽  
Exposure Condition ◽  
Exposure Index ◽  
Lateral Projection ◽  
Exposure Indicator ◽  
Digital Chest

In radiography, the exposure index (EI), as per the International Electrotechnical Commission standard, depends on the incident beam quality and exposure dose to the digital radiography system. Today automatic exposure control (AEC) systems are commonly employed to obtain the optimal image quality. An AEC system can maintain a constant incident exposure dose on the image receptor regardless of the patient thickness. In this study, we investigated the relationship between body thickness, entrance surface dose (ESD), EI, and the exposure indicator (S value) with the aim of using EI as the dose optimization tool in digital chest radiography (posterior–anterior and lateral projection). The exposure condition from the Korean national survey for determining diagnostic reference levels and two digital radiography systems (photostimulable phosphor plate and indirect flat panel detector) were used. As a result, ESD increased as the phantom became thicker with constant exposure indicator, which indicates similar settings to an AEC system, but the EI indicated comparatively constant values without following the tendency of ESD. Therefore, body thickness should be considered under the AEC system for introducing EI as the dose optimization tool in digital chest radiography.

USE OF CLINICAL EXPOSURE INDEX AND DEVIATION INDEX BASED ON NATIONAL DIAGNOSTIC REFERENCE LEVEL AS DOSE-OPTIMIZATION TOOLS FOR GENERAL RADIOGRAPHY IN KOREA

2020 ◽  
Vol 191 (4) ◽  
pp. 439-451
Author(s):  
Hyemin Park ◽  
Yongsu Yoon ◽  
Jungmin Kim ◽  
Jungsu Kim ◽  
Hoiwoun Jeong ◽  
...  
Keyword(s):  
Patient Dose ◽  
Reference Level ◽  
Dose Optimization ◽  
International Electrotechnical Commission ◽  
Exposure Index ◽  
Clinical Exposure ◽  
Deviation Index ◽  
Clinical Environments ◽  
Anterior Posterior ◽  
Exposure Conditions

Abstract The International Electrotechnical Commission introduced the concepts of exposure index (EI), target exposure index (EIT) and deviation index (DI) to manage and optimize patient dose in real time. In this study, we have proposed an appropriate method for setting the EIT based on the Korean national diagnostic reference levels (DRLs). Furthermore, we evaluated the use of clinical EI, EIT and DI as tools for patient dose optimization in clinical environments by observing the changes in DI with those in EIT. According to the Korean national exposure conditions, we conducted experiments on three representative radiographic examinations (chest posterior–anterior, lateral and abdomen anterior–posterior) of clinical environments. As the exposure conditions and DRLs varied, the clinical EI, EIT and DI also varied. These results reveal that the clinical EI, EIT and DI can be used as tools for optimizing the patient dose if EIT is periodically and properly updated.

FEASIBILITY OF DISPLAYED EXPOSURE INDEX IN IEC STANDARD FRAMEWORK AS A DOSE OPTIMISATION TOOL FOR DIGITAL RADIOGRAPHY SYSTEMS

2020 ◽  
Vol 189 (3) ◽  
pp. 384-394 ◽  
Author(s):  
Hyemin Park ◽  
Yongsu Yoon ◽  
Nobukazu Tanaka ◽  
Jungsu Kim ◽  
Jungmin Kim ◽  
...  
Keyword(s):  
Digital Radiography ◽  
Computed Radiography ◽  
Digital Systems ◽  
International Electrotechnical Commission ◽  
Exposure Index ◽  
Radiation Beam ◽  
Dose Optimisation ◽  
Two Systems ◽  
Standard Framework ◽  
Exposure Conditions

Abstract International Electrotechnical Commission (IEC) established the framework for the use of exposure index (EI) for evaluating the exposure conditions with various digital systems. In this study, we investigated the feasibility of EI, as per the IEC, by comparing the EIs obtained through manual calculated and that displayed on the console of two computed radiography (CR) and digital radiography (DR) systems with radiation beam qualities of RQA3,5,7 and 9. As a result, both two systems indicated an uncertainty of less than 20% for both calculated and displayed EI with all beam qualities except displayed EI obtained by RQA3. However, the displayed EI values were different even under the same exposure conditions because of the characteristics of the imaging receptor materials, such as BaFI or CsI, of two systems. Therefore, when an operator attempts to introduce displayed EI for managing radiation dose, it is essential to understand the characteristics of the digital system.

Assessment of Digital Chest Radiography Using Stimulable Phosphor

1989 ◽  
Vol 30 (6) ◽  
pp. 581-586 ◽  
Author(s):  
M. Kehler ◽  
U. Albrechtsson ◽  
B. Andersson ◽  
H. Lárusdóttir ◽  
A. Lundin ◽  
...  
Keyword(s):  
Pilot Study ◽  
Spatial Resolution ◽  
Digital Radiography ◽  
Chest Radiography ◽  
Conventional Radiograph ◽  
Conventional Film ◽  
Digital Chest

In this pilot study, conventional and digital radiography of the chest was compared in 170 patients. Two digitized radiographs, one frequency modified and one simulating the conventional film-screen combination, and the conventional films were reviewed independently by 5 radiologists with different experience. In spite of the smaller size and lower spatial resolution of the digitized compared with the conventional radiograph, only slight differences were revealed in the observation of different pulmonary and mediastinal changes. Digitized radiography is therefore considered suitable for chest examinations.

scholarly journals Scatter rejection and low-contrast performance of a slot-scan digital chest radiography system with electronic aft-collimation: A chest phantom study

2008 ◽  
Vol 35 (6Part1) ◽  
pp. 2391-2402 ◽  
Author(s):  
Xinming Liu ◽  
Chris C. Shaw ◽  
Chao-Jen Lai ◽  
Mustafa C. Altunbas ◽  
Lingyun Chen ◽  
...  
Keyword(s):  
Chest Radiography ◽  
Phantom Study ◽  
Low Contrast ◽  
Radiography System ◽  
Digital Chest

scholarly journals The Effect of Source to Image-Receptor Distance(SID) on Radiation Dose for Digital Chest Radiography

2014 ◽  
Vol 8 (4) ◽  
pp. 203-210 ◽  
Author(s):  
Soonmu Kwon ◽  
Changhee Park ◽  
Jeongkyu Park ◽  
Woonheung Son ◽  
Jaeeun Jung
Keyword(s):  
Radiation Dose ◽  
Chest Radiography ◽  
Digital Chest

Detection of Small Peripheral Lung Cancer by Digital Chest Radiography

1999 ◽  
Vol 40 (5) ◽  
pp. 505-509 ◽  
Author(s):  
Z.-G. Yang ◽  
S. Sone ◽  
F. Li ◽  
S. Takashima ◽  
Y. Maruyama ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Chest Radiography ◽  
Peripheral Lung Cancer ◽  
Peripheral Lung ◽  
Digital Chest

Longitudinal distribution of O3 absorption in the lung: gender differences and intersubject variability

1996 ◽  
Vol 81 (4) ◽  
pp. 1651-1657 ◽  
Author(s):  
Michele L. Bush ◽  
Patrick T. Asplund ◽  
Kristen A. Miles ◽  
Abdellaziz Ben-Jebria ◽  
James S. Ultman
Keyword(s):  
Gender Differences ◽  
Dead Space ◽  
Ambient Air ◽  
Exposure Dose ◽  
Longitudinal Distribution ◽  
Exposure Condition ◽  
Intersubject Variability ◽  
Quiet Breathing ◽  
Mass Transfer Parameter ◽  
Conducting Airways

Bush, Michele L., Patrick T. Asplund, Kristen A. Miles, Abdellaziz Ben-Jebria, and James S. Ultman. Longitudinal distribution of O3 absorption in the lung: gender differences and intersubject variability. J. Appl. Physiol. 81(4): 1651–1657, 1996.—Because the National Ambient Air Quality Standard for ozone (O3) is intended to protect the most sensitive individuals in the general population, it is necessary to identify sources of intersubject variation in the exposure-dose-response cascade. We hypothesize that differences in lung anatomy can modulate exposure-dose relationships between individuals, and this results in differences between their responsiveness to O3 at a fixed exposure condition. During quiet breathing, the conducting airways remove the majority of inhaled O3, so the volume of this region should have an important impact on O3 dose distribution. Employing the bolus inhalation method, we measured the distribution of O3 absorption with respect to penetration volume (VP), and using the Fowler single-breath N2washout method, we determined the dead space volume (Vd) in the lungs of 10 men and 10 women at a fixed respiratory flow of 250 ml/s. On average, the women absorbed O3 at smaller VP than the men, and the women had smaller Vd than the men. When expressed in terms of VP/ Vd, the absorption distribution of the men and women was indistinguishable. Moreover, an interpretation of the O3 distribution in terms of an intrinsic mass transfer parameter ( Ka) indicated that differences between the O3 dosimetry in all subjects, whether men or women, could be explained by a unique correlation with anatomic dead space: Ka (in s−1) = 610 Vd −1.05(in ml). Application of this result to measurements of O3 exposure response indicated that previously reported gender differences may be due to a failure in properly accounting for tissue surface within the conducting airways.

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