Evaluation of the Image Quality of Temporal Subtraction Images Produced Automatically in a PACS Environment

Sakai, Shuji; Soeda, Hiroyasu; Furuya, Akio; Yabuuchi, Hidetake; Okafuji, Takashi; Yamamoto, Keiji; Honda, Hiroshi; Doi, Kunio

doi:10.1007/s10278-006-0625-5

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…Future work includes applications of the proposed method to visualize short T2 tissues in other parts of the human body, such as the brain, ankle, and joints. In the present study, an optimal exponential factor was selected using criteria based on CNR; however, it can be selected using other criteria based on practical needs, such as the five-point scale (24,25).…”

Section: Discussionmentioning

confidence: 99%

Exponential subtraction in 3D ultrashort echo time imaging to visualize short T2 tissues in tibia

Huang

et al. 2019

Acta Radiol

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Background Short T2 tissues can be directly visualized by dual-echo ultrashort echo time imaging with weighted subtraction. As a type of post-processing method, exponential subtraction of ultrashort echo time images with an optimal exponential factor is expected to provide improved positive short T2 contrast. Purpose To test the feasibility and effectiveness of exponential subtraction in three-dimensional ultrashort echo time imaging and to determine the optimal exponential factor. Material and Methods A dual-echo three-dimensional ultrashort echo time sequence was implemented on a 3-T MRI system. Exponential subtraction was performed on dual three-dimensional ultrashort echo time images of the tibia of seven healthy volunteers with exponential factors in the range of 1.00–3.00 in increments of 0.01. The regions of interest, including cortical bone, marrow, and muscle, were depicted on subtracted images of different exponential factors. Contrast-to-noise ratio values were calculated from these regions of interest and then used to assess the optimal exponential factor. To determine intra-observer agreement regarding region of interest selection, paired intra-observer measurements of regions of interest in all direct subtraction images were conducted with a one-week interval and the paired measurements were assessed using Bland–Altman analysis and paired-samples t-test. Results Cortical bone can be better visualized by using exponential subtraction in three-dimensional ultrashort echo time imaging; the suggested optimal exponential factor is 1.99–2.03 in the tibia. Paired measurements showed excellent intra-observer agreement. Conclusion It is feasible to visualize cortical bone of the tibia using exponential subtraction in three-dimensional ultrashort echo time imaging. Compared with weighted subtraction images, exponential subtraction images with an optimal exponential factor provide enhanced visualization of short T2 tissues.

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Section: Discussionmentioning

confidence: 99%

Exponential subtraction in 3D ultrashort echo time imaging to visualize short T2 tissues in tibia

Huang

et al. 2019

Acta Radiol

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Integration of Temporal Subtraction and Nodule Detection System for Digital Chest Radiographs into Picture Archiving and Communication System (PACS): Four-year Experience

et al. 2007

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Since May 2002, temporal subtraction and nodule detection systems for digital chest radiographs have been integrated into our hospital's picture archiving and communication systems (PACS). Image data of digital chest radiographs were stored in PACS with the digital image and communication in medicine (DICOM) protocol. Temporal subtraction and nodule detection images were produced automatically in an exclusive server and delivered with current and previous images to the work stations. The problems that we faced and the solutions that we arrived at were analyzed. We encountered four major problems. The first problem, as a result of the storage of the original images' data with the upside-down, reverse, or lying-down positioning on portable chest radiographs, was solved by postponing the original data storage for 30 min. The second problem, the variable matrix sizes of chest radiographs obtained with flat-panel detectors (FPDs), was solved by improving the computer algorithm to produce consistent temporal subtraction images. The third problem, the production of temporal subtraction images of low quality, could not be solved fundamentally when the original images were obtained with different modalities. The fourth problem, an excessive false-positive rate on the nodule detection system, was solved by adjusting this system to chest radiographs obtained in our hospital. Integration of the temporal subtraction and nodule detection system into our hospital's PACS was customized successfully; this experience may be helpful to other hospitals.

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Usefulness of Temporal Subtraction Images for Identification of Interval Changes in Successive Whole-Body Bone Scans: JAFROC Analysis of Radiologists’ Performance

Shiraishi

Appelbaum

et al. 2007

Academic Radiology

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Evaluation of the Image Quality of Temporal Subtraction Images Produced Automatically in a PACS Environment

Cited by 4 publications

References 16 publications

Exponential subtraction in 3D ultrashort echo time imaging to visualize short T2 tissues in tibia

Exponential subtraction in 3D ultrashort echo time imaging to visualize short T2 tissues in tibia

Integration of Temporal Subtraction and Nodule Detection System for Digital Chest Radiographs into Picture Archiving and Communication System (PACS): Four-year Experience

Usefulness of Temporal Subtraction Images for Identification of Interval Changes in Successive Whole-Body Bone Scans: JAFROC Analysis of Radiologists’ Performance

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