scholarly journals Visualization of small visceral arteries on abdominal CT angiography using ultra-high-resolution CT scanner

2021 ◽  
Author(s):  
Kazuya Ogawa ◽  
Hiromitsu Onishi ◽  
Masatoshi Hori ◽  
Atsushi Nakamoto ◽  
Takashi Ota ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Image Quality ◽  
Ct Angiography ◽  
Ct Scanner ◽  
High Resolution Computed Tomography ◽  
Abdominal Ct ◽  
Small Arteries ◽  
Ct Value ◽  
Visceral Arteries

Abstract Purpose To evaluate the image quality and ability to delineate the small visceral arteries of high-resolution (HR) abdominal CT angiography (CTA) using an ultra-high-resolution computed tomography (UHR CT) scanner. Materials and methods Thirty-seven patients were enrolled who underwent abdominal CTA using a UHR CT scanner. The images were reconstructed with a matrix of 1024 × 1024 and 0.25 mm thickness for HR CTA and with a matrix of 512 × 512 and 0.5 mm thickness for normal resolution (NR) CTA. Maximum CT value, image quality, and delineation of the small arteries were compared between HR CTA and NR CTA. Results HR CTA showed significantly higher maximum CT value, higher image quality, and better delineation of the small arteries than did NR CTA (P < .005). Conclusion HR CTA using a UHR CT scanner showed higher image quality than NR CTA and enhanced the delineation of visceral arteries.

scholarly journals Correction: Ultra-High-Resolution Computed Tomography of the Lung: Image Quality of a Prototype Scanner

PLoS ONE ◽  
2015 ◽  
Vol 10 (12) ◽  
pp. e0145357
Author(s):  
Ryutaro Kakinuma ◽  
Noriyuki Moriyama ◽  
Yukio Muramatsu ◽  
Shiho Gomi ◽  
Masahiro Suzuki ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Image Quality ◽  
High Resolution Computed Tomography

scholarly journals Reconstruction of High-Resolution Computed Tomography Image in Sinogram Space

2021 ◽  
Vol 15 ◽  
pp. 84-88
Author(s):  
Osama A. Omer
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Image Quality ◽  
Computational Cost ◽  
Super Resolution ◽  
Reconstruction Method ◽  
High Resolution Computed Tomography ◽  
Resolution Image ◽  
Reconstruction Methods

An important part of any computed tomography (CT) system is the reconstruction method, which transforms the measured data into images. Reconstruction methods for CT can be either analytical or iterative. The analytical methods can be exact, by exact projector inversion, or non-exact based on Back projection (BP). The BP methods are attractive because of thier simplicity and low computational cost. But they produce suboptimal images with respect to artifacts, resolution, and noise. This paper deals with improve of the image quality of BP by using super-resolution technique. Super-resolution can be beneficial in improving the image quality of many medical imaging systems without the need for significant hardware alternation. In this paper, we propose to reconstruct a high-resolution image from the measured signals in Sinogram space instead of reconstructing low-resolution images and then post-process these images to get higher resolution image.

scholarly journals Assessment of Disease Activity and Complications in Patients of Pulmonary Tuberculosis by High Resolution Computed Tomography

2021 ◽  
Author(s):  
Ashwani Jain ◽  
Ankur Malhotra ◽  
Deepti Arora ◽  
Mazher Maqusood ◽  
Sunil Kumar
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Pulmonary Tuberculosis ◽  
Disease Activity ◽  
Post Treatment ◽  
Research Centre ◽  
Imaging Features ◽  
Ct Scanner ◽  
High Resolution Computed Tomography

Background: Tuberculosis (TB) is a global health problem and the second most common infectious cause of death. High-resolution computed tomography (HRCT) is far more superior to chest radiography as well as conventional CT for analyzing the pulmonary parenchyma. This study aimed to evaluate the role of HRCT in pulmonary tuberculosis (PTB) with respect to disease activity and complication after anti-tubercular therapy (ATT). Methods: This prospective observational study was conducted in the Department of Radiodiagnosis, Teerthanker Mahaveer Medical College & Research Centre (TMMC&RC) for a period of 1.5 years. A total of 50 cases of newly diagnosed TB were included in the study and a standard six-month ATT was given to the patients. Pulmonary involvement was evaluated by HRCT (128 slice multi-detector PHILIPS INGENUITY CT scanner), twice for each patient (first scan after diagnosis and second after treatment completion). The acquired HRCT images were reconstructed on a highresolution lung algorithm and parenchymal, bronchial, and extra parenchymal findings were recorded systematically. Results: Out of the 50 patients, 5 died within two months of the initiation of treatment and four were lost to follow-up. Thus, post treatment follow-up sample size was reduced to 41 patients. Ill-defined nodules (96%), tree-in-bud pattern (74%), consolidation (86%), cavitary lesions (98%), and ground glass opacities (58%) were the main imaging features of active cases of TB on HRCT. Resolution to thin-walled cavitary lesions (36.5%), bronchiectasis (41.5%), and fibrotic (parenchymal) bands (66%) were common complications or sequelae which were observed after completion of treatment. Conclusion: HRCT thorax is a sensitive modality for evaluation of parenchymal and airway manifestations in cases of PTB and can aid in differentiation of active disease from healed disease. It allows early identification of post-treatment complications and sequelae in patients of PTB.

scholarly journals A Hospital based study of High Resolution Computed Tomography and Conventional Radiography for Evaluation of Pathologies of Temporal Bone

2020 ◽  
Vol 8 (1) ◽  
pp. 18-23
Author(s):  
P Ram Ravi Kumar
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Temporal Bone ◽  
Treatment Plan ◽  
Plain Radiography ◽  
Bone Lesions ◽  
X Rays ◽  
Ct Scanner ◽  
High Resolution Computed Tomography ◽  
Total N

Background: Many imaging modalities have been in use for the evaluation of temporal bone lesions. Plain X-rays are cost-effective however; they provide limited details and hence sometimes may result in an inaccurate diagnosis. With the advent of HRCT, the method of imaging of temporal bone has evolved with special algorithms and multiplanar formats. In the present study, we tried to evaluate the different pathologies of the temporal bone with X-ray and HRCT. Methods: The study was conducted in the Departments of Otorhinolaryngology and Radiology, Prathima Institute of Medical Sciences, Naganoor, Karimnagar. A total of n=40 patients were identified and selected based on their symptoms and clinical findings suggestive of a lesion involving the temporal bone such as Otalgia, Otorrhoea, And Sensorineuronal deafness, pulsatile tinnitus, vertigo, and giddiness. These patients were subjected to high resolution computed tomography of the temporal bone on the 128 Slice CT Scanner (PHILIPS INGENUITY). The patients also underwent plain Radiography of temporal bone (CARESTREAM DRX-1 System). Results: Of the total n=40 patients studied the most common temporal bone disease was due to inflammation 85% and tumors were found in 15% of the patients. The common site of involvement of middle ear and mastoid air cells in chronic otitis media was epitympanum in n=30(90%) of cases, Mesotympanum in n=20(60%) of cases. In diseased ears, radiographs of the mastoids revealed pneumatised mastoid in 6(15%), diploic in 6(15%), and sclerosed mastoid in 28(70%) cases. HRCT temporal bone revealed pneumatised mastoid in 9(22.5%), diploic in 5(12.5%) and sclerosed mastoid in 26(65%) cases. Conclusion: The role of plain radiography is found to be limited to know the type of mastoid pneumatisation. It can also as Original Article detect bony erosion in few cases. Because of the ability to see temporal bone structures with great clarity, HRCT can be recommended not only in cases suspected with potential complications but also in all cases of temporal bone pathologies to know the extent of disease, inter-relationships of the tympanomastoid compartment with adjacent neurovascular structures, varied pneumatisation and the presence of anatomical variations, which should alert the clinician and guide in surgical approach and treatment plan.

High-Resolution Computed Tomography Examinations for Chronic Suppurative Lung Disease in Early Childhood: Radiation Exposure and Image Quality Evaluations with Iterative Reconstruction Algorithm Use

2016 ◽  
Vol 67 (3) ◽  
pp. 218-224 ◽  
Author(s):  
Magdalini Smarda ◽  
Efstathios Efstathopoulos ◽  
Argyro Mazioti ◽  
Sofia Kordolaimi ◽  
Agapi Ploussi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Image Quality ◽  
Radiation Exposure ◽  
Iterative Reconstruction ◽  
Reconstruction Algorithm ◽  
Filtered Backprojection ◽  
Reconstruction Algorithms ◽  
High Resolution Computed Tomography ◽  
Iterative Reconstruction Algorithm

Purpose High radiosensitivity of children undergoing repetitive computed tomography examinations necessitates the use of iterative reconstruction algorithms in order to achieve a significant radiation dose reduction. The goal of this study is to compare the iDose iterative reconstruction algorithm with filtered backprojection in terms of radiation exposure and image quality in 33 chest high-resolution computed tomography examinations performed in young children with chronic bronchitis. Methods Fourteen patients were scanned using the filtered backprojection protocol while 19 patients using the iDose protocol and reduced milliampere-seconds, both on a 64-detector row computed tomography scanner. The iDose group images were reconstructed with different iDose levels (2, 4, and 6). Radiation exposure quantities were estimated, while subjective and objective image qualities were evaluated. Unpaired t tests were used for data statistical analysis. Results The iDose application allowed significant effective dose reduction (about 80%). Subjective image quality evaluation showed satisfactory results even with iDose level 2, whereas it approached excellent image with iDose level 6. Subjective image noise was comparable between the 2 groups with the use of iDose level 4, while objective noise was comparable between filtered backprojection and iterative reconstruction level 6 images. Conclusions The iDose algorithm use in pediatric chest high-resolution computed tomography reduces radiation exposure without compromising image quality. Further evaluation with iterative reconstruction algorithms is needed in order to establish high-resolution computed tomography as the gold standard low-dose method for children suffering from chronic lung diseases.

scholarly journals Ultra-High-Resolution Computed Tomography of the Lung: Image Quality of a Prototype Scanner

PLoS ONE ◽  
2015 ◽  
Vol 10 (9) ◽  
pp. e0137165 ◽  
Author(s):  
Ryutaro Kakinuma ◽  
Noriyuki Moriyama ◽  
Yukio Muramatsu ◽  
Shiho Gomi ◽  
Masahiro Suzuki ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Image Quality ◽  
High Resolution Computed Tomography
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