The present invention relates to a method and an apparatus for Cone-Beam Computerized Tomography,(CBCT) capable of increasing the maximum Field-Of-View (FOV) through a composite scanningprotocol, based on the acquisition and reconstruction of multiple volumes relating to partially overlappingdifferent anatomic areas, and on the subsequent stitching of said volumes, so as to obtain, as final result, asingle final volume having dimensions larger than what would be allowed by the geometry of theacquisition system.CBCT apparatuses are known in the art, and allow to obtain tomographic images of an anatomic portion,by acquiring a sequence of bi-dimensional radiographic images during the rotation of a systemcomprising an X-ray source and a X-ray detector around the anatomic part to be acquired.A CBCT apparatus comprises substantially: an X-ray source projecting a conic X-ray beam (unless it issubsequently collimated) through an object to be acquired, a bi-dimensional X-ray detector positioned soas to measure the intensity of radiation after passing through the object, a mechanical support on whichsaid X-ray source and detector are fixed, a mechanical system allowing the rotation and the translation ofsaid support around the object, so as to acquire radiographic images from different positions; an electronicsystem capable of regulating and synchronizing the functioning of the various components of theapparatus; a computer or similar, capable of allowing the operator to control the functions of theapparatus, and of reconstructing and visualizing the acquired images. On the market there aresubstantially two kinds of such apparatuses: a first kind where the patient stands or sits vertically during the acquisition, described e.g. in patent EP2018121B1 Sirona; and a second kind where the patient lies on a table, described e.g. in patent IT1277796 QR.
Method and apparatus to increase the field of view in a cone beam computerized tomography acquisition
MENEGAZ, Gloria;
2013-01-01
Abstract
The present invention relates to a method and an apparatus for Cone-Beam Computerized Tomography,(CBCT) capable of increasing the maximum Field-Of-View (FOV) through a composite scanningprotocol, based on the acquisition and reconstruction of multiple volumes relating to partially overlappingdifferent anatomic areas, and on the subsequent stitching of said volumes, so as to obtain, as final result, asingle final volume having dimensions larger than what would be allowed by the geometry of theacquisition system.CBCT apparatuses are known in the art, and allow to obtain tomographic images of an anatomic portion,by acquiring a sequence of bi-dimensional radiographic images during the rotation of a systemcomprising an X-ray source and a X-ray detector around the anatomic part to be acquired.A CBCT apparatus comprises substantially: an X-ray source projecting a conic X-ray beam (unless it issubsequently collimated) through an object to be acquired, a bi-dimensional X-ray detector positioned soas to measure the intensity of radiation after passing through the object, a mechanical support on whichsaid X-ray source and detector are fixed, a mechanical system allowing the rotation and the translation ofsaid support around the object, so as to acquire radiographic images from different positions; an electronicsystem capable of regulating and synchronizing the functioning of the various components of theapparatus; a computer or similar, capable of allowing the operator to control the functions of theapparatus, and of reconstructing and visualizing the acquired images. On the market there aresubstantially two kinds of such apparatuses: a first kind where the patient stands or sits vertically during the acquisition, described e.g. in patent EP2018121B1 Sirona; and a second kind where the patient lies on a table, described e.g. in patent IT1277796 QR.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
