Head and Neck Cancer Clinical Trial
Official title:
Comparison of Endoscopic Visualization and CT Imaging of Head and Neck Cancers With Pathological Validation
The purpose of this clinical research is to compare new methods of identifying the locations of tumours to standard CT imaging. Analysis of the tissue removed during surgery (pathology) will be used to determine which method is more accurate. Accurately identifying the locations of tumours is especially important for radiation therapy, where the radiation needs to cover the entire tumour while minimizing the amount normal tissue that is exposed to radiation. The new method uses optical imaging (endoscopy) that can be mapped to the CT imaging using device tracking technologies. CT imaging is used to create the radiation treatment plans and so tumour locations are normally provided by CT images. The advantage of the new technology that is being tested is that it may be able to locate regions of a tumour that are at the surface of the tissue. These tumours are difficult to see using CT imaging but easy to see using optical imaging. Currently, there is no accurate way of mapping the optical imaging to the CT images used in radiation therapy. This study will enable the investigators to test the new optical imaging by comparing the tumour that the investigators identify using CT imaging alone against using CT imaging plus the optical imaging technology. The results from this imaging will be compared to pathology findings.
a CT image that includes a contrast agent that helps to identify the location of the tumour. Small markers will be placed on the participants head prior to the scan so that the investigators can align this CT image with the tracking technology used during the surgery. The participant will be moved to the surgical table, where the surgery will proceed as it would for standard of care procedures. The tracking technology and optical imaging will be used to identify where the tumour is located at the tissue surface - Tumour tissue and extra tissue surrounding the tumour will be removed, as would occur normally in surgery. Some markers may be placed on the tissue where it is cut. These will be helpful in matching the tissue that is removed with its location in the images. - A second CT image will be taken immediately following the tissue removal. This will be made using an imaging device called a cone beam CT. - In collaboration with the pathology department, whole mount tissue samples will be assessed to determine the location of tumour tissue. Using the markings on the tissue and images taken of the tissue sample after it has been removed, the location of the tumour in the tissue sample will be compared to the location of the tumour in the CT image and the location of the surface tumour determined by the optical imaging technology. - The CT images may be analyzed by radiation oncologists, surgeons and physicists. ;
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