title: [Development of computer assisted learning program using cone beam projection for head radiography].
abstract: We present a computer assisted learning (CAL) program to simulate head radiography. The program provides cone beam projections of a target volume, simulating three-dimensional computed tomography (CT) of a head phantom. The generated image is 512 x 512 x 512 pixels with each pixel 0.6 mm on a side. The imaging geometry, such as X-ray tube orientation and phantom orientation, can be varied. The graphical user interface (GUI) of the CAL program allows the study of the effects of varying the imaging geometry; each simulated projection image is shown quickly in an adjoining window. Simulated images with an assigned geometry were compared with the image obtained using the standard geometry in clinical use. The accuracy of the simulated image was verified through comparison with the image acquired using radiography of the head phantom, subsequently processed with a computed radiography system (CR image). Based on correlation coefficient analysis and visual assessment, it was concluded that the CAL program can satisfactorily simulate the CR image. Therefore, it should be useful for the training of head radiography.
authors.affiliation: Department of Radiology, Toho University Ohashi Medical Center, Japan.
authors.forename: Kazuma
authors.initials: K
authors.lastname: Nakazeko
authors.affiliation: Department of Radiology, National Hospital Organization Tokyo Medical Center, Japan.
authors.forename: Hironori
authors.initials: H
authors.lastname: Kajiwara
authors.affiliation: Department of Radiology, Showa University Northern Yokohama Hospital, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Watanabe
authors.affiliation: Faculty of Health Sciences, Nihon Institute of Medical Science, Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Kuwayama
authors.affiliation: Department of Radiology, Juntendo University Hospital, Japan.
authors.forename: Shuhei
authors.initials: S
authors.lastname: Karube
authors.affiliation: Department of Radiology, Toho University Ohashi Medical Center, Japan.
authors.forename: Misao
authors.initials: M
authors.lastname: Araki
authors.affiliation: Department of Radiology, Juntendo University Hospital, Japan.
authors.forename: Takeyuki
authors.initials: T
authors.lastname: Hashimoto
authors.affiliation: Department of Information Processing, Yokohama Soei Junior College, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Shinohara
mesh_terms: D003194:Computer-Assisted Instruction / Q000379:methods*; D054893:Cone-Beam Computed Tomography / Q000295:instrumentation* / Q000379:methods*; D006257:Head / Q000000981:diagnostic imaging*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation* / Q000379:methods*; D056888:Patient Positioning; D019047:Phantoms, Imaging; D013679:Technology, Radiologic / Q000193:education*; D014584:User-Computer Interface