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   Phantom study on radiotherapy planning using PET/CT - Delineation of GTV by evaluating SUV  
   
نویسنده uto f. ,shiba e. ,onoue s. ,yoshimura h. ,takada m. ,tsuji y. ,fukugami s. ,asakawa i. ,tamamoto t. ,hasegawa m.
منبع journal of radiation research - 2010 - دوره : 51 - شماره : 2 - صفحه:157 -164
چکیده    We assessed the usefulness of pet/ct images to determine the target volume in radiotherapy planning by evaluating the standardized uptake value (suv). we evaluated the imaging conditions and image- reconstruction conditions of pet/ct useful for treatment planning by collecting 18f-fdg images of acrylic spheres (10-48 mm in diameter) in a phantom. the 18f-fdg concentration in the spheres was 10- fold higher than that of the phantom. the contours were delineated according to the suv by the threshold and regions of interest (roi) methods. comparisons of two- and three-dimensional (2d and 3d) acquisition images indicated that the sharpness and quantitative qualities of the sphere boundaries were better in the former than in the latter. in the extraction of outlines using the suv,outlines obtained at an suv of 40-50% of the maximum agreed well with the actual acrylic sphere size. 2d acquisition images are more suitable for delineating target volume contours,although 3d acquisition images are more popular in diagnostic imaging. an suv of 40-50% of the maximum is suggested to be appropriate for gtv contouring of sphere tumors with homogenously distributed 18f-fdg.
کلیدواژه 18F-FDG; CT; PET; Radiotherapy planning; Standardized uptake value; Target delineation
آدرس department of radiology,takai hospital,461-2 kuranosho-cho,tenri,nara 632-0006,japan,department of radiation oncology,nara medical university,840 shijo-cho,kashihara,nara 634-8522, Japan, department of radiology,takai hospital,461-2 kuranosho-cho,tenri,nara 632-0006, Japan, department of radiology,takai hospital,461-2 kuranosho-cho,tenri,nara 632-0006, Japan, department of radiology,takai hospital,461-2 kuranosho-cho,tenri,nara 632-0006, Japan, ge-yokogawa medical systems,67-4 takakura-cho,hachioji,tokyo,192-0003, Japan, division of central radiology,nara medical university,840 shijo-cho,kashihara,nara 634-8522, Japan, division of central radiology,nara medical university,840 shijo-cho,kashihara,nara 634-8522, Japan, department of radiation oncology,nara medical university,840 shijo-cho,kashihara,nara 634-8522, Japan, department of radiation oncology,nara medical university,840 shijo-cho,kashihara,nara 634-8522, Japan, department of radiation oncology,nara medical university,840 shijo-cho,kashihara,nara 634-8522, Japan
 
     
   
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