Radial differential interior tomography and its image reconstruction with differentiated backprojection and projection onto convex sets

Tang, Shaojie; Tang, Xiangyang

doi:10.1118/1.4812676

Cited by 4 publications

(2 citation statements)

References 53 publications

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“…22,28,29 Such distortion can be reduced by a multitude of interior reconstruction algorithms 22,[29][30][31][32][33][34][35][36][37] -the most common of which are the projection completion techniques based methods. 18,38 For interior micro-CT with detector offset, there are two types of truncation.…”

Section: Discussionmentioning

confidence: 99%

Interior micro‐CT with an offset detector

et al. 2014

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Purpose:The size of field-of-view (FOV) of a microcomputed tomography (CT) system can be increased by offsetting the detector. The increased FOV is beneficial in many applications. All prior investigations, however, have been focused to the case in which the increased FOV after offset-detector acquisition can cover the transaxial extent of an object fully. Here, the authors studied a new problem where the FOV of a micro-CT system, although increased after offset-detector acquisition, still covers an interior region-of-interest (ROI) within the object. Methods: An interior-ROI-oriented micro-CT scan with an offset detector poses a difficult reconstruction problem, which is caused by both detector offset and projection truncation. Using the projection completion techniques, the authors first extended three previous reconstruction methods from offset-detector micro-CT to offset-detector interior micro-CT. The authors then proposed a novel method which combines two of the extended methods using a frequency split technique. The authors tested the four methods with phantom simulations at 9.4%, 18.8%, 28.2%, and 37.6% detector offset. The authors also applied these methods to physical phantom datasets acquired at the same amounts of detector offset from a customized micro-CT system. Results: When the detector offset was small, all reconstruction methods showed good image quality. At large detector offset, the three extended methods gave either visible shading artifacts or high deviation of pixel value, while the authors' proposed method demonstrated no visible artifacts and minimal deviation of pixel value in both the numerical simulations and physical experiments. Conclusions: For an interior micro-CT with an offset detector, the three extended reconstruction methods can perform well at a small detector offset but show strong artifacts at a large detector offset. When the detector offset is large, the authors' proposed reconstruction method can outperform the three extended reconstruction methods by suppressing artifacts and maintaining pixel values.

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Section: Discussionmentioning

confidence: 99%

Interior micro‐CT with an offset detector

et al. 2014

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“…As a matter of fact, the patient receives much unnecessary radiation on the tissues and organs besides the heart in this scanning mode. Therefore, the study of the region of interest (ROI) scanning and reconstruction method becomes a hot issue in CT technical field [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Automatic heart positioning method in computed tomography scout images

Liang

Liu

Sun

et al. 2014

Bio-Medical Materials and Engineering

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Computed tomography (CT) radiation dose can be reduced significantly by region of interest (ROI) CT scan. Automatically positioning the heart in CT scout images is an essential step to realize the ROI CT scan of the heart. This paper proposed a fully automatic heart positioning method in CT scout image, including the anteroposterior (A-P) scout image and lateral scout image. The key steps were to determine the feature points of the heart and obtaining part of the heart boundary on the A-P scout image, and then transform the part of the boundary into polar coordinate system and obtain the whole boundary of the heart using slant elliptic equation curve fitting. For heart positioning on the lateral image, the top and bottom boundary obtained from A-P image can be inherited. The proposed method was tested on a clinical routine dataset of 30 cases (30 A-P scout images and 30 lateral scout images). Experimental results show that 26 cases of the dataset have achieved a very good positioning result of the heart both in the A-P scout image and the lateral scout image. The method may be helpful for ROI CT scan of the heart.

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From ‘Image Gently’ to image intelligently: a personalized perspective on diagnostic radiation risk

Guillerman

2014

Pediatr Radiol

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The risk of ionizing radiation from diagnostic imaging has been a popular topic in the radiology literature and lay press. Communicating the magnitude of risk to patients and caregivers is problematic because of the uncertainty in estimates derived principally from epidemiological studies of large populations, and alternative approaches are needed to provide a scientific basis for personalized risk estimates. The underlying patient disease and life expectancy greatly influence risk projections. Research into the biological mechanisms of radiation-induced DNA damage and repair challenges the linear no-threshold dose-response assumption and reveals that individuals vary in sensitivity to radiation. Studies of decision-making psychology show that individuals are highly susceptible to irrational biases when judging risks. Truly informed medical decision-making that respects patient autonomy requires appropriate framing of radiation risks in perspective with other risks and with the benefits of imaging. To follow the principles of personalized medicine and treat patients according to their specific phenotypic and personality profiles, diagnostic imaging should optimally be tailored not only to patient size, body region and clinical indication, but also to underlying disease conditions, radio-sensitivity and risk perception and preferences that vary among individuals.

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Radial differential interior tomography and its image reconstruction with differentiated backprojection and projection onto convex sets

Cited by 4 publications

References 53 publications

Interior micro‐CT with an offset detector

Interior micro‐CT with an offset detector

Automatic heart positioning method in computed tomography scout images

From ‘Image Gently’ to image intelligently: a personalized perspective on diagnostic radiation risk

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