CT reconstruction algorithm for a dental panoramic x-ray unit.
A variable Jacobian and weighted backprojection algorithm, used for medical CT, was adapted to perform CT reconstructions on data obtained with a dental panoramic x-ray unit. A detector array, fitted to the unit for the purpose of acquiring digital panoramic radiographs, was used to collect the data. Compensations were made for the incomplete (230 degrees) rotation of the panoramic x-ray unit, the non-fixed centre of rotation, the irregular rotation of the x-ray target and detector, and the resulting variances in magnification. The algorithm was tested on mathematically simulated phantoms and on acquired data. Reconstruction of simulated data proved the success of the algorithm. Real data reconstructions showed some defects as a result of inaccuracies in quantifying the experimental panoramic device.
Lee
M D
MD
Department of Radiology, University of Texas Health Science Center, San Antonio 78284-7800.
Waggener
R G
RG
McDavid
W D
WD
Dove
S B
SB
Welander
U
U
Tronje
G
G
D000465:Algorithms; D000818:Animals; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008961:Models, Structural; D011862:Radiography, Panoramic / Q000295:instrumentation* / Q000379:methods; D051381:Rats; D014057:Tomography, X-Ray Computed / Q000379:methods*