IP Library › Granted Patent US 12,239,494
Granted Patent B1
US 12,239,494 · App. 17/882,508 · Granted Mar 4, 2025

Hand-held stereovision system for image updating in surgery

Inventors: Keith D. Paulsen (Lebanon, NH); Xiaoyao Fan (Hanover, NH); Songbai Ji (Hanover, NH); Sohail K. Mirza (Fairfax, VA)
Assignee: The Trustees of Dartmouth College
A61B90/361A61B34/20H04N13/239H04N13/246A61B2090/371A61B2090/502
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Quick Facts
Patent No.
US 12,239,494
App. No.
17/882,508
Granted
Mar 4, 2025
Kind
B1
Abstract

This invention provides a hand-held stereovision (HHS) system that is an efficient, accurate, and radiation-free imaging device to acquire intraoperative profiles of the exposed spine in prone position. The reconstructed intraoperative stereovision surfaces (iSV) are registered with preoperative CT (pCT; supine position) in a nonrigid fashion to generate updated CT images (uCT) and correct for vertebral posture and alignment changes. Updated CT images are uploaded to a commercial navigation system for surgical navigation.

Claims (40)

1. A stereoscopic vision system for use in surgery procedures comprising:

a handheld stereovision (HHS) device comprising:

a body;

at least two cameras mounted to the body, the at least two cameras angled towards a center of a field of view, and having an overlapping region of view;

a surgical tracker; and

a data connection to a processor that registers intraoperative stereovision surfaces (iSV) of vertebrae in the overlapping region of view with preoperative CT data by referencing a model of intervertebral motion that (i) maintains anatomically realistic vertebral orientations by modeling the intervertebral motion of segmented vertebrae parameterized for Lie group rotational transformation, and (ii) achieves smooth transitions between individual vertebra by constraining pose changes of the segmented vertebrae for adjacent parameterized vertebra through constrained optimization of the pose changes for the Lie group rotational transformation.

2. The stereoscopic vision system of claim 1 wherein the processor is operatively connected to the handheld stereovision device through the data connection, the processor comprising:

an image data gathering module; and

a tracking data gathering module.

3. The stereoscopic vision system of claim 2 , the processor further comprising:

a stereo calibration module; and

a spatial calibration module.

4. The stereoscopic vision system of claim 2 , the processor further comprising an iSV reconstruction module.

5. The stereoscopic vision system of claim 2 , the processor further comprising a patient registration module.

6. The stereoscopic vision system of claim 2 , further comprising a surgical navigation system.

7. The stereoscopic vision system of claim 6 , further comprising an external monitor display system or heads-up display within the surgeon's field of view.

8. A method of performing surgery using a handheld stereovision system, the method comprising:

obtaining a handheld stereovision (HHS) device, the HHS device including at least two cameras and a surgical tracker;

gathering image information from the two or more cameras and location data from the surgical tracker at the same time;

reconstructing iSV images;

registering patient data with the reconstructed (iSV) images by referencing a model of intervertebral motion that: (i) maintains anatomically realistic vertebral orientations by modeling the intervertebral motion of segmented vertebrae in the images parameterized for Lie group rotational information, and (ii) achieves smooth transitions between individual vertebra by constraining pose changes of the segmented vertebrae for adjacent parameterized vertebra through constrained optimization of the pose changes for the Lie group rotational transformation;

uploading the registered iSV images as uCT images to a surgical navigation system; and

performing a surgery in a surgery treatment area using the uCT images with the surgical navigation system.

9. The method of claim 8 , further comprising:

calibrating stereo images; and

calibrating spatial images.

10. The method of claim 8 , wherein the surgery treatment area is a lumbar region of the vertebra.

11. The method of claim 8 , further comprising moving the HHS by hand over the surgery treatment area to increase a size of an area being analyzed for surgery.

12. An apparatus for using data from a handheld stereoscopic (HHS) device to assist with surgery comprising:

a computer system; and

computer code in the computer system, the computer code comprising:

a method for gathering image information from two or more cameras on the HHS;

a method for gathering location information from a tracker on the HHS;

a method for reconstructing iSV images;

a method for registering patient data with the reconstructed (iSV) images by referencing a model of intervertebral motion of the vertebrae that: (i) maintains anatomically realistic vertebral orientations by modeling the intervertebral motion of segmented vertebrae parameterized for Lie group rotational transformation, and (ii) achieves smooth transitions between individual vertebra by constraining pose changes of the segmented vertebrae for between adjacent parameterized vertebra through constrained optimization of the pose changes for the Lie group rotational transformation; and

a method for uploading the registered iSV images as uCT images to a surgical navigation system.

13. The apparatus of claim 12 , wherein the computer code further comprises a method for displaying the uCT images to a surgeon during surgery to improve surgical outcomes.

14. The apparatus of claim 12 , wherein the computer code further comprises:

a method of calibrating stereo images; and

a method of calibrating spatial images.

Continuity (2)
Continuation 16595377 · Oct 7, 2019
Provisional Application 62742313 · Oct 6, 2018
References Cited (107)
US 7755608B2 · Chang · 2010 [cited by applicant]
US 9119670B2 · Yang · 2015 [cited by examiner]
US 11406471B1 · Paulsen · 2022 [cited by examiner]
US 20080135733A1 · Feilkas · 2008 [cited by examiner]
US 20140303491A1 · Shekhar · 2014 [cited by examiner]
US 20160191887A1 · Casas · 2016 [cited by examiner]
US 20160287211A1 · DaCosta · 2016 [cited by examiner]
Lurie et al., “Effects of Viewing an Evidence-Based Video Decision Aid on Patients' Treatment Preferences for Spine Surgery”, Spine (Phila Pa 1976). Aug. 15, 2011; 36(18): 1501-1504. doi:10.1097/BRS.0b013e3182055c1e. [cited by applicant]
Lurie et al., “Indications for spine surgery: validation of an administrative coding algorithm to classify degenerative diagnoses”, Spine (Phila Pa 1976) Apr. 20, 2014, 39(9), 769-779. [cited by applicant]
Lurie et al., “Long-Term Outcomes of Lumbar Spinal Stenosis: Eight-Year Results of the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1976). Jan. 15, 2015; 40(2): 63-76. doi:10.1097/BRS.0000000000000731. [cited by applicant]
Lurie et al., “Rates of Advanced Spinal Imaging and Spine Surgery”, Spine vol. 28, No. 6, pp. 616-620, 2003. [cited by applicant]
Lurie et al., “Reliability of Readings of Magnetic Resonance Imaging Features of Lumbar Spinal Stenosis”, Spine (Phila Pa 1976). Jun. 15, 2008; 33(14): 1605-1610. doi: 10.1097/BRS.0b013e3181791af3. [cited by applicant]
Martin et al. “Hospital and Surgeon Variation in Complications and Repeat Surgery Following Incident Lumbar Fusion for Common Degenerative Diagnoses”, Health Research and Educational Trust, DOI: 10.1111/.1475-6773.2012.… [cited by applicant]
Martin et al., “How Do Coverage Policies Influence Practice Patterns, Safety, and Cost of Initial Lumbar Fusion Surgery? A Population-based Comparison of Workers' Compensation Systems”, Spine J. Jul. 1, 2014, 14(7), 123… [cited by applicant]
Martin et al., “Reoperation Rates Following Lumbar Spine Surgery and the Influence of Spinal Fusion Procedures”, Spine vol. 32, No. 3, pp. 382-387, 2007. [cited by applicant]
Martin et al., “Repeat Surgery Following Lumbar Decompression for Herniated Disc: The Quality Implications of Hospital and Surgeon Variation”, Spine J. Feb. 2012, 12(2), 89-97. [cited by applicant]
Martin et al., “Trends in Health Care Expenditures Utilization, and Health Status Among US Adults With Spine Problems, 1997-2006”, Spine vol. 34, No. 19, pp. 2077-2084. [cited by applicant]
Martin, et al., “Expenditures and Health Status Among Adults with Back and Neck Problems”, JAMA, Feb. 13, 2008, vol. 299, No. 6 (reprinted), pp. 656-664, downloaded from https://jamanetwork.com/ on Sep. 29, 2020. [cited by applicant]
Martin, et al., “Variation in the Care of Surgical Conditions: Spinal Stenosis”, A Dartmouth Atlas of Health Care Series, The Dartmouth Institute, 2014 (c) Trustees of Dartmouth College, 48 pages. [cited by applicant]
McGuire et al., “The Effect of Extreme Obesity on Outcomes of Treatment for Lumbar Spinal Conditions: Subgroup Analysis of the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1976). Nov. 1, 2014; 39(23):… [cited by applicant]
Mirza et al., “Accuracy of Thoracic Vertebral Body Screw Placement Using Standard Fluoroscopy, Fluoroscopic Image Guidance, and Computed Tomographic Image Guidance”, Spine vol. 28, No. 4, pp. 402-413. 2003. [cited by applicant]
Mirza et al., “Developing a Toolkit for Comparing Safety in Spine Surgery”, Instructional Course Lectures vol. 63, Apr. 2014, p. 271-286. [cited by applicant]
Mirza et al., “Development of an Index to Characterize the “Invasiveness” of Spine Surgery”, Spine, vol. 33, No. 24, pp. 2651-2661, 2008. [cited by applicant]
Mirza et al., “Towards standardized measurement of adverse events in spine surgery: conceptual model and pilot evaluation”, BioMed Central, BMC Musculoskeletal Disorders, 2006, 7:53, 16 pages. [cited by applicant]
Nandyala et al., “Minimally invasive transforaminal lumbar interbody fusion: one surgeon's learning curve”, The Spine Journal 14 (2014) 1460-1465. [cited by applicant]
Nevzati et al., “Accuracy of Pedicle Screw Placement in the Thoracic and Lumbosacral Spine Using a Conventional Intraoperative Fluoroscopy-Guided Technique: A National Neurosurgical Education and Training Center Analysi… [cited by applicant]
Park et al., “Does Multilevel Lumbar Stenosis Lead to Poorer Outcomes? A Subanalysis of the SPORT Lumbar Stenosis Study”, Spine (Phila Pa 1976). Feb. 15, 2010; 35(4): 439-446. doi:10.1097/BRS.0b013e3181bdafb9. [cited by applicant]
Patel et al., “Facet Violation With the Placement of Percutaneous Pedicle Screws”, Spine vol. 36, No. 26, pp. E1749-E1752. 2011. [cited by applicant]
Pearson et al., “Predominant Leg Pain Is Associated With Better Surgical Outcomes in Degenerative Spondylolisthesis and Spinal Stenosis: Results from the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1… [cited by applicant]
Pearson et al., “Spine Patient Outcomes Research Trial”, Spine vol. 33, No. 25, pp. 2759-2766. 2008. [cited by applicant]
Pearson et al., “Who should have surgery for spinal stenosis? Treatment Effect Predictors in SPORT”, Spine (Phila Pa 1976). Oct. 1, 2012, 37(21), 1791-1802. [cited by applicant]
Pearson, et al., “Degenerative Spondylolisthesis Versus Spinal Stenosis”, Spine 2010, vol. 35, No. 3, pp. 298-305. [cited by applicant]
Pfuntner, et al., “Most Frequent Procedures Performed in US Hospitals, 2011”, HCUP, AHRQ, Statistical Brief #165, Oct. 2013, 10 pages. [cited by applicant]
Radcliff et al., “Does the duration of symptoms in patients with spinal stenosis and degenerative spondylolisthesis affect outcomes? Analysis of the Spine Outcomes Research Trial”, Spine (Phila Pa 1976). Dec. 1, 2011, 3… [cited by applicant]
Radcliff et al., “Epidural Steroid Injections Are Associated with Less Improvement in the Treatment of Lumbar Spinal Stenosis: A subgroup analysis of the SPORT”, Spine (Phila Pa 1976). Feb. 15, 2013; 38(4): 279-291. doi… [cited by applicant]
Radcliff et al., “Risk for Adjacent Segment and Same Segment Reoperation After Surgery for Lumbar Stenosis: A subgroup analysis of the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1976). Apr. 1, 2013;… [cited by applicant]
Rajaee et al., “National trends in revision spinal fusion in the USA, Patient Characteristics and Complications”, Bone Join J, 2014, 96-B:807-16. [cited by applicant]
Rajaee et al., “Spinal Fusion in the United States, Analysis of Trends from 1998 to 2008”, Spine vol. 37, No. 1, pp. 67-76, 2012. [cited by applicant]
Rihn et al., “Does obesity affect outcomes of treatment for lumbar stenosis and degenerative spondylolisthesis? Analysis of the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1976) Nov. 1, 2012, 37(23),… [cited by applicant]
Rihn et al., “Effectiveness of Surgery for Lumbar Stenosis and Degenerative Spondylolisthesis in the Octogenarian Population”, J Bone Joint Surg Am, 2015, 97, 177-185. [cited by applicant]
Sagi, et al., “Electromagnetic Field-Based Image-Guided Spine Surgery Part One: Results of a Cadaveric Study Evaluating Lumbar Pedicle Screw Placement,” Spine 2003 28(17) pp. 2013-2018. [cited by applicant]
Smorgick et al., “Single Versus Multilevel Fusion, For Single Level Degenerative Spondylolisthesis And Multilevel Lumbar Stenosis. Four-Year Results of the Spine Patient Outcomes Research Trial”, Spine (Phila Pa 1976). … [cited by applicant]
Spitz et al., “Percutaneous “K-wireless” pedicle screw fixation technique: an evaluation of the initial experience of 100 screws with assessment of accuracy, radiation exposure, and procedure time”, JNS Spine, J Neurosu… [cited by applicant]
Tian, et al., “Pedicle screw insertion accuracy with different assisted methods: a systematic review and meta-analysis of comparative studies,” Eur Spine J 2011 20 (6) 846-59. [cited by applicant]
Tjardes, et al., “Image-guided spine surgery: state of the art and future directions,” Eur Spine J 2010 19 (1) 25-45. [cited by applicant]
Tosteson et al., “Comparative Effectiveness Evidence from the Spine Patient Outcomes Research Trial: Surgical vs. Non-Operative Care for Spinal Stenosis, Degenerative Spondylolisthesis and Intervertebral Disc Herniation… [cited by applicant]
Tosteson et al., “Surgical Treatment of Spinal Stenosis with and without Degenerative Spondylolisthesis: Cost-Effectiveness after 2 Years”, Ann Intern Med. Dec. 16, 2008; 149(12): 845-853. [cited by applicant]
Tow et al., “Does Navigation Improve Accuracy of Placement of Pedicle Screws in Single-level Lumbar Degenerative Spondylolisthesis? A Comparison O-Arm Navigation Techniques”, Journal of Spinal disorders & Techniques, 28… [cited by applicant]
von Jako, et al., “Electromagnetic navigation for percutaneous guide-wire insertion: Accuracy and efficiency compared to conventional fluoroscopic guidance,” Neuroimage 2009 47 Suppl 2 T127-32. [cited by applicant]
Walsh et al., “Is a Condition-Specific Instrument for Patients with Low Back Pain/Leg Symptoms Really Necessary? The Responsiveness of the Oswestry Disability Index, MODEMS, and the SF-36”, Spine vol. 28, No. 6, pp. 607… [cited by applicant]
Wang et al., “Fusion techniques for adult isthmic spondylolisthesis: a systematic review”, Arch Orthop Trauma Surg (2014) 134:777-784. [cited by applicant]
Weinstein et al., “Surgical versus Non-Operative Treatment for Lumbar Spinal Stenosis Four-Year Results of the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1976). Jun. 15, 2010; 35(14): 1329-1338. doi… [cited by applicant]
Weinstein et al., “Surgical versus Nonsurgical Therapy for Lumbar Spinal Stenosis”, N Engl J Med. Feb. 21, 2008; 358(8): 794-810. doi: 10.1056/NEJMoa0707136. [cited by applicant]
Weinstein, et al., “Surgical Compared with Nonoperative Treatment for Lumbar Degenerative Spondylolisthesis”, Journal of Bone and Joint Surgery, Inc., 2009, pp. 1295-1304. [cited by applicant]
Weinstein, et al., “Surgical versus Nonsurgical Treatment for Lumbar Degenerative Spondylolisthesis”, The New England Journal of Medicine, 2007, vol. 356, pp. 2257-2270. [cited by applicant]
Weinstein, et al., “United States' Trends and Regional Variations in Lumbar Spine Surgery: 1992-2003”, Spine 2006, vol. 31, No. 23, pp. 2707-2714. [cited by applicant]
Yang et al., “Robot-Assisted Anterior Lumbar Interbody Fusion in a Swine Model In Vivo Test of the da Vinci Surgical- Assisted Spinal Surgery System”, Spine vol. 36, No. 2, pp. E139-E143. 2011. [cited by applicant]
Abdu et al., “Degenerative Spondylolisthesis: Does Fusion Method Influence Outcome? Four-Year Results of the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1976). Oct. 1, 2009; 34(21): 2351-2360. doi:10… [cited by applicant]
Allen et al., “Comparison Between Gearshift And Drill Techniques For Pedicle Screw Placement By Resident Surgeons”, Int J Spine Surg 2015, vol. 9, article 23, DOI: 10.14444/2023, 6 pages. [cited by applicant]
Arega et al., “Racial Variation in Treatment Preferences and Willingness to Randomize in the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1976). Sep. 1, 2006; 31(19): 2263-2269. doi: 10.1097/01.prs.00… [cited by applicant]
Bao et al., “Fiducial markers configuration optimization in image-guided surgery”, Bio-Medical Materials and Engineering 24(2014) 3361-3371. [cited by applicant]
Benzel, et al., “Complications in Spine Surgery: Honesty Is the Best Policy,” World Neurosurg. Aug.-Sep. 2010; 74(2-3) 273-4. [cited by applicant]
Birkmeyer et al., “Design of the Spine Patient Outcomes Research Trial (SPORT)”, Spine (Phila Pa 1976) Jun. 15, 2002, 27(12), 1361-1372. [cited by applicant]
Cai et al., “Automatic Geometric Rectification for Patient Registration in Image-guided Spinal Surgery”, Proc of SPIE, vol. 9786, 10 pages. 2016. [cited by applicant]
Carreon, et al., “Perioperative Complications of Posterior Lumbar Decompression and Arthrodesis in Older Adults,” JBJS 2003 85 A(11) 2089-92. [cited by applicant]
Cizik et al., “Using the Spine Surgical Invasiveness Index to Identify Risk of Surgical Site Infection, A Multivariate Analysis”, J Bone Joint Surg Am, 2012, 94, 335-342. [cited by applicant]
Cummins et al., “Descriptive Epidemiology and Prior Healthcare Utilization of Patients in the Spine Patient Outcomes Research Trial's (SPORT) Three Observational Cohorts: Disc Herniation, Spinal Stenosis and Degenerativ… [cited by applicant]
Desai et al., “Outcome Variation Across Centers After Surgery for Lumbar Stenosis and Degenerative Spondylolisthesis: The SPORT Experience”, Spine (Phila Pa 1976). Apr. 15, 2013; 38(8): 678-691. doi:10.1097/BRS.0b013e31… [cited by applicant]
Desai et al., “SPORT: Does incidental durotomy affect long-term outcomes in cases of Spinal Stenosis?” Neurosurgery. Mar. 2015; 76(01): S57-S63. doi: 10.1227/01.neu.0000462078.58454.14. [cited by applicant]
Desai et al., “SPORT: Does Incidental Durotomy Affect Long-term Outcomes in Cases of Spinal Stenosis?”, Neurosurgery, 2011, 69(1) 38-44. [cited by applicant]
Desai et al., “Surgery for Lumbar Degenerative Spondylolisthesis in Spine Patient Outcomes Research Trial”, Spine vol. 37, No. 5, pp. 406-413, 2012. [cited by applicant]
Deyo et al., “Back Pain Prevalence and Visit Rates, Estimates from US National Surveys, 2002”, Spine vol. 31, No. 23, pp. 2724-2727. [cited by applicant]
Deyo et al., “Error in Trends, Major Medical Complications, and Charges Associated with Surgery for Lumbar Spinal Stenosis in Older Adults”, JAMA, Sep. 14, 2011, vol. 306, No. 10. [cited by applicant]
Deyo et al., “Interspinous Spacers Compared to Decompression or Fusion for Lumbar Stenosis: Complications and Repeat Operations in the Medicare Population”, Spine (Phila Pa 1976) May 1, 2013, 38(10), 15 pages. [cited by applicant]
Deyo et al., “Overtreating Chronic Back Pain: Time to Back Off?” J Am Board Fam Med. 2009, 22(1), 62-68. [cited by applicant]
Deyo et al., “Revision Surgery Following Operations for Lumbar Stenosis”, J Bone Joint Surg Am, 2011, 93, 1979-1986. [cited by applicant]
Deyo et al., “Trends, Major Medical Complications, and Charges Associated with Surgery for Lumbar Spinal Stenosis In Older Adults”, JAMA, Apr. 7, 2010, vol. 303, No. 13, pp. 1259-1265. [cited by applicant]
Deyo et al., “Use of Bone Morphogenetic Proteins in Spinal Fusion Surgery for Older Adults With Lumbar Stenosis”, Spine vol. 37, No. 3, pp. 222-230. 2012. [cited by applicant]
Deyo, et al., “Trends and Variations in the Use of Spine Surgery”, Clinical Orthopaedics and Related Research, No. 443, pp. 139-146, 2006. [cited by applicant]
Deyo, et al., “United States Trends in Lumbar Fusion Surgery for Degenerative Conditions”, Spine 2005, vol. 30, No. 12, pp. 1441-1445. [cited by applicant]
Ershad et al., “Minimization of target registration error for vertebra in image-guided spine surgery”, Int J Cars (2014) 9:29-38. [cited by applicant]
Fan et al., “Intraoperative fiducial-less patient registration using volumetric 3D ultrasound: a prospective series of 32 neurosurgical cases”, J Neurosurg. Sep. 2015, 123(3): 721-731, DOI: 10.3171/2014.12.JNS141321. [cited by applicant]
Fritz et al., “The Associations Between Physical Therapy and Long-Term Outcomes for Individuals with Lumbar Spinal Stenosis in the SPORT study”, Spine J. Aug. 1, 2014; 14(8): 1611-1621. doi:10.1016/j.spinee.2013.09.044. [cited by applicant]
Gelalis et al., “Accuracy of pedicle screw placement: a systematic review of prospective in vivo studies comparing free hand, fluoroscopy guidance and navigation techniques,” Eur Spine J 2012 21(2) 247-55. [cited by applicant]
Gerard et al., “An analysis of tracking error in image-guided neurosurgery”, Journal of the International Foundation for Computer Assisted Radiology and Surgery, vol. 10, No. 10, Oct. 2015, 1579-1588. [cited by applicant]
Ghobrial et al., “latrogenic neurologic deficit after lumbar spine surgery: A review”, Clinical Neurology and Neurosurgery 139 (2015) 76-80. [cited by applicant]
Gill et al., “Biomechanically constrained groupwise ultrasound to CT registration of the lumbar spine”, Medical Image Analysis 16 (2012) 662-674. [cited by applicant]
Hartov et al., “Adaptive spatial calibration of a 3D ultrasound system”, 2010 American Association of Physicists in Medicine, DOI: 10.1118/1.3373520, Med. Phys. 37(5), pp. 2121-2130. [cited by applicant]
Holly, et al., “Image Guidance in Spine Surgery,” Orthop Clin North Am 2007 38 (3) 451-61. [cited by applicant]
Holly, et al., “Intraoperative Spinal Navigation,” Spine 2003, 28 (15 Suppl) 554-61. [cited by applicant]
Ji et al., “Combining Multiple True 3-D Ultrasound Image vols. through Re-registration and Rasterization”, Med. Image Comput. Comput. Assist. Interv, Oct. 1, 2009, 12(Pt. 1), 795-802. [cited by applicant]
Ji et al., “Cortical surface shift estimation using stereovision and optical flow motion tracking via projection image registration”, Medical Image Analysis 18 (2014) 1169-1183. [cited by applicant]
Ji et al., “Cortical Surface Strain Estimation Using Stereovision”, Med Image Comput Comput Assist Interv. 2011 ; 14 (01):412-419. [cited by applicant]
Ji et al., “Efficient Stereo Image Geometrical Reconstruction at Arbitrary Camera Settings from a Single Calibration”, Med Image Comput Comput Assist Interv. 2014, 17(01) pp. 440-447. [cited by applicant]
Ji et al., “Flow-Based Correspondence Matching in Stereovision”, MLMI 2013, LNCS 8184, pp. 106-113, 2013. [cited by applicant]
Ji et al., “Intraoperative CT as a registration benchmark for intervertebral motion compensation in image-guided open spinal surgery”, International Journal of Computer Assisted Radiology and Surgery, Jul. 2015, pp. 200… [cited by applicant]
Ji et al., “Intraoperative patient registration using volumetric true 3D ultrasound without fiducials”, Med Phys 39(12), Dec. 2012, pp. 7540-7552. [cited by applicant]
Ji et al., “Mutual-information-based image to patient re-registration using intraoperative ultrasound in image-guided neurosurgery”, Med. Phys. 35(10), Oct. 2008, pp. 4612-4624. [cited by applicant]
Ji et al., “Patient Registration Using Intraoperative Stereovision in Image-guided Open Spinal Surgery”, IEEE Trans Biomed Eng. Sep. 2015; 62(9): 2177-2186. doi:10.1109/TBME.2015.2415731. [cited by applicant]
Ji et al., “Real-time Interpolation for True 3-Dimensional Ultrasound Image Volumes”, J Ultrasound Med. Feb. 2011, 30(2), pp. 243-252. [cited by applicant]
John W. Frymoyer, MD, “Point of View”, Spine 2005, vol. 30, No. 12, pp. 1446-1447. [cited by applicant]
Koivukangas et al., “Technical accuracy of optical and the electromagnetic tracking systems”, SpringerPlus 2013, 2:90, 7 pages, http://www.springerplus.com/content/2/1/90. [cited by applicant]
Koreckij, et al., “Degenerative Spondylolisthesis”, J. Spinal Disord Tech Aug. 2015; vol. 28, No. 7, pp. 236-241. [cited by applicant]
Krebs et al., “Predictors of long-term opioid use among patients with painful lumbar spine conditions”, J Pain, Jan. 2010, 11(1), 15 pages. [cited by applicant]
Kurd et al., “Predictors of Treatment Choice in Lumbar Spinal Stenosis: A Sport Study”, Spine (Phila Pa 1976). Sep. 1, 2012; 37(19): 1702-1707. doi:10.1097/BRS.0b013e3182541955. [cited by applicant]
Lee et al., “Risk Factors for Medical Complication After Lumbar Spine Surgery”, Spine vol. 36, No. 21, pp. 1801-1806. [cited by applicant]
Lieberman et al., “Assessment of Pedicle Screw Placement Accuracy, Procedure Time, and Radiation Exposure Using a Miniature Robotic Guidance System”, J Spinal Disord Tech, vol. 25, No. 5, Jul. 2012, www.jspinaldisorders… [cited by applicant]