Determination of radiation dose and low-dose protocol for digital chest tomosynthesis using radiophotoluminescent (RPL) glass dosimeters

Relative dose-response from solid-state and gel dosimeters through Monte Carlo simulations

“…in the function of the depth of phantom. The PDD ratios shown in figure 7, for 250 kV, reflect significant differences for state-solid rather than gel dosimeters; even state-solid detectors (TLD-100 and GD-301) are used in some applications in medical physics [10,11,68]. Nevertheless, dosimetric gels are widely used in medical physics research (16)(17)(18)69), with differences increasing in depth, as shown in figures 5 and 7.…”

Automated size‐specific dose estimates framework in thoracic CT using convolutional neural network based on U‐Net model

“…The CT dose descriptor in terms of CTDI vol reported by the scanner is the average CTDI vol across all slices of the scan range. The CTDI vol is calculated on the basis of measurements made in a standard polymethyl methacrylate (PMMA) cylindrical phantom of a specified size with either a 16‐cm head or a 32‐cm body phantom to quantify the x‐ray tube output emitted by the scanner 6–8 . Since a tube voltage of 120 kVp was used, the f value was calculated according to Equations () and () as follows 11,12,15 : $$$$\begin{equation}f = 3.704369 \times {e}^{ - 0.03671937 \times {\bm{D}}_{{\bm{eff}}}^{{\bm{corr}}}}\end{equation}$$$$ $$$$\begin{equation}f = 3.704369 \times {e}^{ - 0.03671937 \times {{\bm{D}}}_{\bm{w}}}\end{equation}$$$$where D eff corr and D w are patient size specific expressed in centimeters.…”

“…Implementation of protocol optimization is an essential approach to minimizing potential risks associated with exposure to ionizing radiation while still achieving the required diagnostic information 4,5 . Accurate dose estimation enables physicians to weigh the examination benefits against the potential harm to the patient and make informed decisions about the use of CT examinations 6–8 . In 2011, the American Association of Physicists in Medicine (AAPM) Task Group 204 (TG204) published a patient‐specific dose descriptor based on the size of the patient called the size‐specific dose estimate (SSDE) 9 .…”

“… 4 , 5 Accurate dose estimation enables physicians to weigh the examination benefits against the potential harm to the patient and make informed decisions about the use of CT examinations. 6 , 7 , 8 In 2011, the American Association of Physicists in Medicine (AAPM) Task Group 204 (TG204) published a patient‐specific dose descriptor based on the size of the patient called the size‐specific dose estimate (SSDE). 9 The SSDE calculation involves multiplying the volumetric CT dose index (CTDI vol , expressed in milligray) by the patient size‐dependent conversion factor (f size ).…”

"Multimodal" Imaging Performance and Clinical Application of Coronavirus Disease 2019 (COVID-19)

“…DTS technology is an emerging photography technology that combines modern computer reconstruction image theory with traditional X-ray tomography technology. It uses low-dose X-rays with different incidence angles for exposure, collects projection information of tissue and organ images at different angles, and obtains digital images at any coronal level of the examination site by ltered back projection method [13]. Compared with conventional CXR, it avoids many different the effect of overlapping density tissues on the display of ne structures in the lungs improves the ability to detect ne lesions in the lungs [14].DTS can obtain continuous coronal tomographic images, breaking through the "visual barrier" caused by the large number of anatomical structures overlapped on the conventional CXR to the diagnostician, and can show the detail of the lesion more clearly [15].…”