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Improving Accuracy for Image Fusion in Abdominal Ultrasonography
Department of Radiology, Rigshospitalet, Copenhagen Univsersity Hospital, Blegdamsvej 9, Copenhagen OE DK-2100, Denmark
* Author to whom correspondence should be addressed.
Received: 27 June 2012; in revised form: 30 July 2012 / Accepted: 22 August 2012 / Published: 27 August 2012
Abstract: Image fusion involving real-time ultrasound (US) is a technique where previously recorded computed tomography (CT) or magnetic resonance images (MRI) are reformatted in a projection to fit the real-time US images after an initial co-registration. The co-registration aligns the images by means of common planes or points. We evaluated the accuracy of the alignment when varying parameters as patient position, respiratory phase and distance from the co-registration points/planes. We performed a total of 80 co-registrations and obtained the highest accuracy when the respiratory phase for the co-registration procedure was the same as when the CT or MRI was obtained. Furthermore, choosing co-registration points/planes close to the area of interest also improved the accuracy. With all settings optimized a mean error of 3.2 mm was obtained. We conclude that image fusion involving real-time US is an accurate method for abdominal examinations and that the accuracy is influenced by various adjustable factors that should be kept in mind.
Keywords: ultrasound; image-fusion; CT; accuracy
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MDPI and ACS Style
Ewertsen, C.; Hansen, K.L.; Henriksen, B.M.; Nielsen, M.B. Improving Accuracy for Image Fusion in Abdominal Ultrasonography. Diagnostics 2012, 2, 34-41.
Ewertsen C, Hansen KL, Henriksen BM, Nielsen MB. Improving Accuracy for Image Fusion in Abdominal Ultrasonography. Diagnostics. 2012; 2(3):34-41.
Ewertsen, Caroline; Hansen, Kristoffer L.; Henriksen, Birthe M.; Nielsen, Michael B. 2012. "Improving Accuracy for Image Fusion in Abdominal Ultrasonography." Diagnostics 2, no. 3: 34-41.