Augmented Reality (AR) brings immersive experiences to users. With recent advances in computer vision and mobile computing, AR has scaled across platforms, and has increased adoption in major products. One of the key challenges in enabling AR features is proper anchoring of the virtual content to the real world, a process referred to as tracking. In this paper, we present a system for motion tracking, which is capable of robustly tracking planar targets and performing relative-scale 6DoF tracking without calibration. Our system runs in real-time on mobile phones and has been deployed in multiple major products on hundreds of millions of devices.

Purpose: When admitted to the hospital, individuals with celiac disease rely on food handlers for provision of safe, uncontaminated gluten-free meals. We aimed to assess the knowledge of gluten-free diet (GFD) amongst individuals involved in meal preparation for patients. Methods: A questionnaire with 10 demographic and 35 test items to assess knowledge of GFD, including workplace scenarios encountered in meal preparation, was administered to food handlers including cooks, utility workers, dietary technicians, and supervisors in 2 tertiary care, university-affiliated hospitals. A score of ≥28 of 35 (≥80%) was considered a “pass”. Results: A total of 72 individuals completed the study, mean age 40.3 ± 1.6 years, 75% female. Only 42 (56.8%) scored ≥80% and achieved a pass. The average score was 75.9% ± 13.4%, range 25.7%–100%. The supervisors had significantly higher scores (87.9% ± 11.4%) than utility workers (73.0% ± 11.4%; P = 0.01) and cooks (71.7% ± 14.5%; P = 0.01). Cooks had the lowest scores with 80% scoring <80%. Females scored higher than males (77.8% vs. 68.8%; P = 0.02). Conclusions: There are significant differences in GFD knowledge amongst various groups involved in food preparation in hospitals. The gaps identified in knowledge can potentially compromise the safety of patients with celiac disease. Targeted interventions to educate hospital food handlers about GFD are warranted. Registered Dietitians can play an important role in providing this education.

Background Foreign body ingestion and esophageal food bolus impaction are common emergencies encountered by gastroenterologists. If not treated in a timely fashion these can result in significant morbidity, or even mortality. The mainstay of diagnosis and therapy is endoscopy. Guidelines regarding timing of endoscopy have been published by both the American and European Societies of Gastrointestinal Endoscopy, and both suggest emergent endoscopy, meaning within 2 to 6 hours, for complete esophageal obstructions. There is relatively sparse data regarding the endoscopic techniques used in real world practice. Aims This is a quality assurance study looking at the endoscopic practices at an adult tertiary care hospital in Halifax, Nova Scotia with respect to foreign body and food impaction management. Methods The hospital records of all patients presenting with ingested foreign bodies or esophageal food bolus impactions between May 2018 and July 2019 were included. Patients were identified by searching the call-back forms used by our department which documents all on-call endoscopy cases. This was then cross-referenced by endoscopy nursing charting which documents every endoscopy performed. Information such as demographics, obstruction type, endoscopic method of removal, complications, time between consultation and endoscopy, underlying pathology, and others were analyzed. Results 70 cases were identified. Average patient age was 51.3 years old (range 16–96). 18 (25.7%) were female and 52 (74.3%) were male. 64 cases (91.4%) were esophageal food impactions and 6 (8.57%) were foreign body ingestions. Of the food impactions, 39 cases (60.9%) were cleared by the push/slide-by technique only and 10 (16.7%) were relieved using instruments such as snares, forceps, or nets. 15 (23.4%) passed spontaneously prior to scope, of which 7 received glucagon. An overtube was used in 1 case (0.16%). Complications occurred in 5 (7.8%) cases and included 3 mucosal tears, 2 of which required therapeutic interventions, and 2 episodes of oxygen desaturation in which the procedure was aborted. Complete obstructions occurred in 42 (65.6%) cases with average time of consultation to endoscopy of 2.4 hours. However, 3 (7.1%) cases exceeded 6 hours. The most common pathology was eosinophilic esophagitis with 20 cases (31.3%). Ingested foreign bodies included 2 long objects, 3 sharp objects, and a cylindrical battery, and all but one were in the stomach. 5 (83.3%) cases used an overtube. No complications occurred. Conclusions At our institution 67/70 (95.7%) cases were performed within the timelines recommended by society guidelines. No complications occurred in the cases not performed within those time limits. An overtube was used in only one case in which a food bolus was retrieved out of the esophagus. Overall this study suggests that our centre is meeting recommended targets, however there is room for improvement. Funding Agencies None

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