Single photon emission computed tomography (SPECT) was applied to bone scintigraphy in the head and neck region. Two dimensional-Wiener-filter was used to reduce noise in measured projection data. Ramachandran filter was used as a convolution function at backprojection. This method significantly improved the reconstructed images. On clinical evaluation, SPECT was useful in the maxillary region, in preventing overlap of hotspots on scintigrams. And assembly of transaxial, sagittal and coronal

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... ges could reconstruct three dimensional localization of hot-spots. Free angle tomographic technique was examined in reconstructing slice-images along mandibular bone. Vertical and horizontal extension of hot-area was distinctly recognized by sagittal and transaxial images, respectively.