Craniofacial Phenotyper Freshman Imaging Project Sean Cooper Rebecca Klein
What is Imaging Science? Combination of Physics, Mathematics, Engineering, and Computer Science Studies technology behind scientific images Applies this to scientific research http: //www. cis. rit. edu/
Motivation Researching a new way of assessing the difficulty of intubation as opposed to traditional methods Picture given via email JACK WOJTCZAK URMC ANESTHESIOLOGIST Jack_Wojtczack@URMC. Rochester. edu http: //www. cs. rochester. edu/research/vision/people/Bo_Hu/ BO HU U OF R RESEARCHER bhu@cvs. rochester. edu
Our Assignment Build a Craniofacial Phenotyper Take a 3 D image of the head Use 3 D image generated to find certain measurements Asses the difficulty of intubation for a specific patient
What are we Measuring? Distance following the curvature of the face (3 DS) Between 7 points on the face Also finding the volume of the head
Basic Requirements Accuracy: Our goal is ± 0. 5 mm Cost: Our goal is $3, 000 Speed: 1 to 2 second capture time, quick processing time Robust: small, will not break easily, can be used in a variety of environments; easy/unnecessary calibration Causes no harm to the patient
What is 3 D capture? • MAYBE ADD PICTURE? SOMETHING TO FILL IN WHITE SPACE
Methods of Depth Capture Time of Flight A laser is pulsed Distance is measured from the time it takes for the pulse to return Geometrical Emitter + Sensor at different positions Triangulation
Triangulation Using geometry it is possible to determine depth if you know: The distance between the sensor and the laser (D) Z The angle of incidence (Z) SENSOR D LASER
Point Cloud An output format of a 3 D scanner (. ply) Creates a collection of spatial coordinates From this a mesh (. obj) can be created and surface distances along the curvature can be measured Point cloud bunny http: //www. engineeringspecifier. com/public/primages/pr 1200. jp Mesh bunny http: //www. farfieldtechnology. com/products/toolbox/pointcloud/bunny 1
Equipment Surveys • ADD MORE
Face. Gen September 15, 2011
Kinect
Li. DAR http: //www. saic. com/geospatial/images/lidar 1. jpg
Structured Light Scanner
DAVID Laser Scanner http: //www. david-laserscanner. com/
Good Fair Poor Portability Kinect Z-Scanner Modulated Light C 3 D Stereoscopic System difficult to calibrate Line Scanner Conoscopic Holography Cost DAVID Laser Scanner Silhouette Speed Structed Light Photometric System Robustness Li. DAR (Time of Flight) Accuracy (± . 5 mm) 20 minute capture time
Schedule Fall • Research • Equipment Surveys • Demonstrations of 3 D capture • Pugh Analysis (narrowing down to 3 options) PDR Prelimary Design Review Winter Continue with Pugh Analysis • Trade off studies to test different options • Develop a design (by week 7) • Choose final system option(s) and create Work Breakdown Structures for each CDR Critical Design Review Spring • Complete final design • Buy components • Build system(s) • Test system(s) • Have final product for Coding Research to understand theories of Software Extract measurements from point cloud data
Questions?
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