Monday, October 23, 2006
Sunday, October 22, 2006
Export to DICOM
At the users meeting in Monterey, the subject came up about making orientation changes in the MPR views and then saving those changes to DICOM. Please go back to the AUGUST postings and check out "Export DICOM". There is a sample of how to set up the "Image Output" so that the changes will be saved.
Friday, October 06, 2006
Multiple Oblique Images
As dental imaging technicians, it is our job to provide the clinician with as much information as possible. The i-CAT has the ability to provide vast amounts of data and we need to organize it in such a fashion that allows easy interpretation of the images. With that thought in mind, it becomes apparent that one size does not fit all.
For a typical implant case we may include numerous oblique views. In this example, the doctor requested a full height scan with the focus on the mandible for possible implant placements. In order to enhance the mandibular nerve canal, we used a 2.1mm thickness oblique. You will notice that the nerve virtually “pops” out of the image and is easily seen. The focus in this particular image is only the mandibular nerve, thus the maxilla is not completely visible. If it were possible, I would like to be able to ‘crop’ the maxilla out to avoid confusion. In fact, upon closer examination you will notice that many of the teeth ‘disappear’ in the thin 2.1mm oblique image. This image verifies that the mandibular nerve is not in the same vertical plane as the teeth. Do not confuse the vertical plane with the long axis of the existing dentition! Anything outside of the 2.1mm slice thickness will not be visible, so we also include a “thick” oblique of 20.1mm that mimics the typical panoramic image that the clinician finds very familiar. The i-CAT easily allows thicker oblique views; however, the resultant image tends to possess significantly less detail.
For the cross sectional images we used a 12.3mm thickness, which makes the mandibular nerve still visible yet contains all of the patient’s mandibular anatomy. Only one page of the cross sectional images is shown for clarification. Notice in the “thin” 2.1mm and “thick” 20.1mm oblique images, we DO NOT include the scale because of the possibility that the clinician may attempt to take measurements from these images and compare it directly to the cross sectional images. We want the doctor to use ONLY the one oblique view that the cross sectional images were originally derived from for that particular arch.
The clinician is also provided with cross sectional images of the lateral and coronal TMJ images (not shown) on full height scans. On several occasions, we found many patients who exhibited absolutely no symptoms who had posterior displaced condyles, indicative of a displaced disk. On other patients there was a complete lack of joint space! In all these cases, the clinicians’ were very appreciative of the i-CAT images since they were able to convey these findings with the patient to discuss possible treatment plans. Most of the patients chose not to seek treatment for the TMJ and the clinicians were able to have the patients sign waiver forms declining treatment. Imagine the legal dramas that would have arose had the patients not had the i-CAT scan!
NOTE: The numbers for each oblique image is added manually. i-CAT Vision along with DICOM and PDF files are included with every scan.