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In interior computed tomography (CT), the x-ray beam is collimated to a limited field-of-view (FOV) (e.g. the volume of the heart) to decrease exposure to adjacent organs, but the resulting image has a severe truncation artifact when reconstructed with traditional filtered back-projection (FBP) type algorithms. In some examinations, such as cardiac or dentomaxillofacial imaging, interior CT could be used to achieve further dose reductions. In this work, we describe a deep learning (DL) method to obtain artifact-free images from interior CT angiography. Our method employs the Pix2Pix generative adversarial network (GAN) in a two-stage process: (1) An extended sinogram is computed from a truncated sinogram with one GAN model, and (2) the FBP reconstruction obtained from that extended sinogram is used as an input to another GAN model that improves the quality of the interior reconstruction. Our double GAN (DGAN) model was trained with 10 000 truncated sinograms simulated from real computed tomography angiography slice images. Truncated sinograms (input) were used with original slice images (target) in training to yield an improved reconstruction (output). DGAN performance was compared with the adaptive de-truncation method, total variation regularization, and two reference DL methods: FBPConvNet, and U-Net-based sinogram extension (ES-UNet). Our DGAN method and ES-UNet yielded the best root-mean-squared error (RMSE) (0.03 ± 0.01), and structural similarity index (SSIM) (0.92 ± 0.02) values, and reference DL methods also yielded good results. Furthermore, we performed an extended FOV analysis by increasing the reconstruction area by 10% and 20%. In both cases, the DGAN approach yielded best results at RMSE (0.03 ± 0.01 and 0.04 ± 0.01 for the 10% and 20% cases, respectively), peak signal-to-noise ratio (PSNR) (30.5 ± 2.6 dB and 28.6 ± 2.6 dB), and SSIM (0.90 ± 0.02 and 0.87 ± 0.02). In conclusion, our method was able to not only reconstruct the interior region with improved image quality, but also extend the reconstructed FOV by 20%.
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http://dx.doi.org/10.1088/2057-1976/ac31cb | DOI Listing |
J Int Med Res
December 2024
Department of Pathology, Chungbuk National University Hospital, Cheongju, Korea.
Adenoid cystic carcinoma (ACC) rarely occurs in the nasolacrimal duct (NLD), and when it does, it has nonspecific manifestations. To the best of our knowledge, one case of ACC in the NLD has been reported in the literature. Herein, we report a second case of ACC in the left NLD, concerning a man in his late 60s.
View Article and Find Full Text PDFBr J Radiol
December 2024
Department of Radiology, Northern Jiangsu People's Hospital, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, China.
Objectives: To investigate the feasibility of radiomics models for predicting the source of hepatic metastases from gastrointestinal (GI) vs. non-gastrointestinal (non-GI) primary tumors on contrast enhanced CT(CECT).
Methods: 347 patients with liver metastases (180 from GI and 167 from non-GI) and abdominal CECT including arterial, portal venous, and delayed phases were divided into training (221) and validation (96) sets at a ratio of 7:3 and an independent testing set (30).
Lung India
January 2025
Department of Pulmonary Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Dhanvantari Nagar, Puducherry, India.
Background: The estimated incidence of pulmonary embolism (PE) is around 60-70 cases per 100,000 people annually. The overall mortality rate for massive PE is substantial, ranging from 18% to 65%. We can utilise changes in lung perfusion to stratify patients with PE acutely based on risk, highlighting its diagnostic and prognostic value.
View Article and Find Full Text PDFArch Orthop Trauma Surg
December 2024
Department of Orthopaedic Surgery, Korea University Guro Hospital, 148 Gurodong-ro, Guro- gu, Seoul, 08308, Korea.
Introduction: Although sesamoid-preserving procedures have been attempted to complement sesamoidectomy for hallux sesamoid fracture nonunion, few reports document the results. Accordingly, the objective of this study was to review the outcomes of patients with hallux sesamoid fracture nonunion who underwent screw fixation with autogenous bone grafting.
Materials And Methods: Medical records of patients who underwent surgery between January 2013 and September 2022 were reviewed.
Abdom Radiol (NY)
December 2024
Department of Radiology, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China.
Purpose: To establish the normal ranges of the main portal vein (MPV), left portal vein (LPV), and right portal vein (RPV) diameters in children and adolescents using abdominal contrast-enhanced CT.
Methods: We retrospectively enrolled children and adolescents (under 19 years) who underwent abdominal contrast-enhanced CT examinations in our hospital between January 2018 and January 2024. Subjects with conditions potentially affecting the portal vein diameter were excluded.
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