Radiological Physics and Technology This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

A spatio-temporal image analysis for growth of indeterminate pulmonary nodules detected by CT scan
The objective is to evaluate the performance of computational image classification for indeterminate pulmonary nodules (IPN) chronologically detected by CT scan. Total 483 patients with 670 abnormal pulmonary nodules, who were taken chest thin-section CT (TSCT) images at least twice and resected as suspicious nodules in our hospital, were enrolled in this study. Nodular regions from the initial and the latest TSCT images were cut manually for each case, and approached by Python development environment, using the open-source cv2 library, to measure the nodular change rate (NCR). These NCRs were statistically compared with c...
Source: Radiological Physics and Technology - October 27, 2023 Category: Physics Source Type: research

Creation, evolution, and future challenges of ion beam therapy from a medical physicist ’s viewpoint (Part 3): Chapter 3. Clinical research, Chapter 4. Future challenges, Chapter 5. Discussion, and Conclusion
This article summarizes a series of articles (Parts 1–3) and describes future issues of immune ion beam therapy and linear energy transfer optimization. (Source: Radiological Physics and Technology)
Source: Radiological Physics and Technology - October 26, 2023 Category: Physics Source Type: research

Study on the radiofrequency transparency of partial-ring oval-shaped prototype PET inserts in a 3  T clinical MRI system
In this study, we used electrically floating Faraday RF shield cages to construct different partial-ring configurations of oval and cylindrical PET inserts and performed experiments on the RF field, spin echo and gradient echo images for a homogeneous phantom in a 3  T clinical MRI system. For each geometry, partial-ring configurations were studied by removing an opposing pair or a single shield cage from different positions of the PET ring. Compared to the MRI-only case, reduction in mean RF homogeneity, flip angle, and SNR for the detector opening in the fir st and third quadrants was approximately 13%, 15%, and 43%, re...
Source: Radiological Physics and Technology - October 24, 2023 Category: Physics Source Type: research

Development and evaluation of a novel water-based pigment marker for radiation therapy skin marking
AbstractSkin marks are widely used in external radiation therapy to ensure the accuracy of the irradiation position. However, conventional skin markers contain harmful substance, so we developed an alternative skin marker. The purpose of this study was to investigate the feasibility of using a novel water-based pigment marker comprising safe materials commonly used in cosmetics for clinical radiation therapy. We investigated various properties of the marker, namely marker longevity, color variety, line visibility, ink bleeding, and line durability, and improved the marker in response to the feel when drawing or being drawn...
Source: Radiological Physics and Technology - October 15, 2023 Category: Physics Source Type: research

Pre-acquired CT-based attenuation correction with automated headrest removal for a brain-dedicated PET system
In conclusion, pre-acquired CT-based AC with automated headrest removal is useful for brain-dedicated PET such as VRAIN. (Source: Radiological Physics and Technology)
Source: Radiological Physics and Technology - October 11, 2023 Category: Physics Source Type: research

Characteristics of detection accuracy of the patient setup using InBore optical patient positioning system
This study aimed to evaluate the detection accuracy of the AlignRT-InBore system in surface-guided radiation therapy using a phantom and to determine the feasibility of the system by conducting a comparative analysis with cone-beam computed tomography (CBCT) registration. The AlignRT-InBore system integrated with the ETHOS Therapy was used. A phantom and a QUASAR phantom were employed to examine the specific areas of interest relevant to clinical cases. The evaluation involved monitoring translations for approximately 30 min and assessing the position detection accuracy for static and moving objects. Fifty clinical cases w...
Source: Radiological Physics and Technology - October 9, 2023 Category: Physics Source Type: research

Verification of optimal conditions for the scattering correction of 123I-FP-CIT SPECT on a single-photon emission tomography system with a two-detector whole-body cadmium –zinc–telluride semiconductor detector
AbstractTo identify the optimal scattering correction for 123I-FP-CIT SPECT (DAT-SPECT) using a two-detector whole-body cadmium –zinc–telluride semiconductor detector (C-SPECT) system with a medium-energy high-resolution sensitivity (MEHRS) collimator. The C-SPECT system with the MEHRS collimator assessed image quality and quantification using a striated phantom. Different reconstruction methods and scattering correction settings were compared, including filtered back projection (FBP) and ordered subset expectation maximization (OSEM). Higher %contrast and %CV values were observed >  10% subwindow (SW) for all c...
Source: Radiological Physics and Technology - October 7, 2023 Category: Physics Source Type: research

Shifting-field-of-view technique enhancing the inflow effect for identifying tumor/vessel boundaries in MRI for radiotherapy treatment planning
This study presents two cases of tumors in contact with the inferior vena cava during radiotherapy, and introduces a clinically useful technique for identifying tumor boundaries adjacent to blood vessels by adjusting the position of the field-of-view (FOV) to enhance the inflow effect in magnetic resonance imaging. We named this technique “Shifting-FOV.” This method consists of three steps: (1) remove the upper and lower saturation pulses outside the FOV, (2) align the FOV to position the lower edge of the imaging slab as close to the tumor as possible, and (3) manually adjust the table position to locate the tumor at ...
Source: Radiological Physics and Technology - October 6, 2023 Category: Physics Source Type: research