Planmeca Oy

Jaakko Lahelma

Kustaa Nyholm

Tapio Laukkanen

Timo Muller

Leo Aspelund

Jukka Kanerva

Mikko Lilja

Sakari Kettunen

Henri Veistera

Kalle Karhu

Ari Hietanen

The invention relates to a tomosynthesis process in the context of mammography, in which several individual images of a breast are taken at different projection angles and in which of information thus acquired, tomographic images are synthesized with the help of an applicable image processing software. The mutual geometry of the imaging means of the imaging apparatus when taking these individual images is determined according to the invention by arranging in the imaging apparatus a calibration structure (), which includes balls () or other small objects absorbing X-radiation which are such placed that their projections will become imaged on said individual images.

Mammography imaging arrangement for tomosynthesis

A patient movement correction method for cone-beam computed tomography wherein a set of X-ray projection images of the patient is acquired using the X-ray imaging means. An initial projection geometry estimate describing the spatial positions and orientation of the X-ray source and the X-ray detector during the acquisition of an X-ray projection images is defined. An intermediate CBCT reconstruction using the X-ray projection images and the initial projection geometry estimate is computed. Projection-image-specific corrective geometric transformations are determined for the initial projection geometry estimate and the intermediate CBCT reconstruction. A final CBCT reconstruction is computed using the X-ray projection images and a corrected estimate of the projection geometry corresponding to the determined corrective geometric transformations wherein the corrective geometric transformations for the initial projection geometry estimate are determined in a projection-image-specific rotating coordinate system corresponding to the spatial positions and orientations of the X-ray source and X-ray detector during the acquisition of the X-ray projection images.

Patient movement correction method for cone-beam computed tomography

A dental CT apparatus includes a control system arranged to move a radiation source and an imaging sensor on the opposite sides of an imaging station. The control system includes at least a first imaging mode designed for imaging patients and means for selecting at least one second imaging mode in which the source of radiation and the imaging sensor are driven during an exposure at an angular velocity of less than 4 degrees/second. A digital three dimensional models of teeth are generated based on imaging impressions or models of teeth by a CT apparatus provided with at least one specific imaging mode for the purpose.

Odontological imaging apparatus

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Helsinki, Finland

Jaakko Lahelma