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| Research on accuracy of image fusion with hybrid PET/MR |
| ZHAO Long, XIN Jun, ZHANG Shao-min, SUN Hong-zan, LIU Chang-ping, ZHAI Wei |
| Department of Radiology, Shengjing Hospital of China Medical University, Shenyang 110004, China |
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Abstract Objective: To evaluate the accuracy of image fusion between PET and MR data by 3D whole body PET/MR scanner with the phantoms and Na point sources simulating clinical practice situation. Materials and Methods: Phantoms and Na point sources were provided by Philips company. The six Na point sources were placed at the fixed positions of the phantoms for image fusion coregistration, and then were fixed on the two sides of the bed for simulating different positions of the patient. The PET and MR images were acquired at 2 different loading conditions: ①uniformly loading phantoms of 10 kg on the table; ②uniformly loading phantoms of 60 kg on the table. The Na point sources were manually outlined on axial MR and PET images. The difference between the point sources in PET and MR was obtained by calculating the distance of the respective center of gravities(COGs). Results: The maximal difference was 3.01 mm in the upper and right part of the table, with loading phantoms of 10 kg. The maximal difference was 4.66 mm on the center and right part of the table, with loading phantoms of 60 kg. Conclusions: The accuracy of image fusion can be measured more objectively with these methods, and it can be used for the acceptance test and routine quality control of PET/MR scanner.
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Received: 20 June 2014
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Corresponding Authors:
XIN Jun
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2014, Vol. 25 
