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CT scan range estimation using multiple body parts detection: let PACS learn the CT image content
Sectra, KTH Royal Institute of Technology.
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering. Linköping University, Center for Medical Image Science and Visualization (CMIV).ORCID iD: 0000-0002-9368-0177
2016 (English)In: International Journal of Computer Assisted Radiology and Surgery, ISSN 1861-6410, E-ISSN 1861-6429, Vol. 39, no 2, 149-159 p.Article in journal (Refereed) Published
Abstract [en]

Purpose

The aim of this study was to develop an efficient CT scan range estimation method that is based on the analysis of image data itself instead of metadata analysis. This makes it possible to quantitatively compare the scan range of two studies.

Methods

In our study, 3D stacks are first projected to 2D coronal images via a ray casting-like process. Trained 2D body part classifiers are then used to recognize different body parts in the projected image. The detected candidate regions go into a structure grouping process to eliminate false-positive detections. Finally, the scale and position of the patient relative to the projected figure are estimated based on the detected body parts via a structural voting. The start and end lines of the CT scan are projected to a standard human figure. The position readout is normalized so that the bottom of the feet represents 0.0, and the top of the head is 1.0.

Results

Classifiers for 18 body parts were trained using 184 CT scans. The final application was tested on 136 randomly selected heterogeneous CT scans. Ground truth was generated by asking two human observers to mark the start and end positions of each scan on the standard human figure. When compared with the human observers, the mean absolute error of the proposed method is 1.2 % (max: 3.5 %) and 1.6 % (max: 5.4 %) for the start and end positions, respectively.

Conclusion

We proposed a scan range estimation method using multiple body parts detection and relative structure position analysis. In our preliminary tests, the proposed method delivered promising results.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2016. Vol. 39, no 2, 149-159 p.
Keyword [en]
Scan range estimation, Body parts detection, Structural voting, Machine learning, Pictorial structures, Image classification
National Category
Medical Image Processing
Identifiers
URN: urn:nbn:se:liu:diva-120486DOI: 10.1007/s11548-015-1232-zISI: 000370139200006PubMedID: 26137895OAI: oai:DiVA.org:liu-120486DiVA: diva2:845274
Available from: 2015-08-11 Created: 2015-08-11 Last updated: 2016-03-09Bibliographically approved

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Lundström, Claes
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Media and Information TechnologyFaculty of Science & EngineeringCenter for Medical Image Science and Visualization (CMIV)
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