TECHNIQUE FOR GUIDING BIOPSY NEEDLE IN A COMPUTED TOMOGRAPHY (CT) AND POSITRON EMISSION TOMOGRAPHY/COMPUTED TOMOGRAPHY (PET/CT) SYSTEM
Publication Date: 2016-Apr-16
The IP.com Prior Art Database
A technique for guiding a biopsy needle in computed tomography (CT) and computed tomography/positron emission tomography (PET/CT) systems is disclosed. The technique involves placing and piercing the biopsy needle into a patient by aligning the biopsy needle to a shadow of the biopsy needle projected on the patient. The shadow of the biopsy needle is computed when the biopsy needle is at a point of entry and an angle of entry, planned according to a CT scan performed to localize anatomy of the patient.
The present disclosure relates generally to biopsy systems and more particularly to a technique for guiding biopsy in a computed tomography (CT) and a positron emission tomography/computed tomography (PET/CT) system.
Generally, obtaining a sample of a tumor tissue from inside the body of a patient is a trial and error process even after careful planning conducted by a doctor. The doctors estimate location of the tumor tissue using markers and by computing an angle of insertion based on images of the tumor tissue. However, the process of biopsy after insertion of the needle remains largely unguided and the doctors perform multiple scans to check if the tumor tissue is reached by a biopsy needle. Multiple scans result in both increased procedure duration and radiation dose reaching the patient.
There are various conventional biopsy needle guiding techniques, including CT-guided systems and ultrasound-guided systems. One conventional technique requires breath holding. Another conventional technique includes generating a motion model of a moving target, the tumor tissue or lesion based on the plurality of images and generating a needle advancing path for the biopsy needle based on the motion model of the moving target. Yet another conventional technique includes a grid adapted to be arranged on a patient's skin to provide positioning information in CT-guided percutaneous operations. However, these conventional techniques are expensive and need to be integrated with the CT systems.
It would be desirable to have an improved technique for guiding biopsy in a computed CT and PET/CT system.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 depicts a concept that a shadow created by a point source of an object is unique for the 3-dimensional (3D) position of the object for the point source.
Figure 2 depicts a system according to one embodiment of the technique for guiding a biopsy needle.
Figure 3 depicts a CT scan of patient anatomy mapped to a particular location of a table, selection of the biopsy needle type and determination of an entry point and angle of entry of the biopsy needle
Figure 4 depicts and alternate embodiment of the technique in which the projector projects three dots, a first dot at the entry point, a second dot at top of the biopsy needle at entry point, and a third dot at top of needle once the biopsy needle reached required depth at the tumor tissue.
Figure 5 depicts the doctor placing tip of the biopsy needle on the entry point and aligning the biopsy needle such that the second dot coincides with top of the biopsy needle.
Figure 6 depicts the doctor continuing to pierce the biopsy needle into the patient till the third dot coincides with top of the biopsy needle.
Figure 7 depicts the system having two projectors placed at right angles to each other for increased convenience.