ObjectiveTo evaluate the application value of virtual reality (VR) technology in the surgical treatment of coronary artery fistula (CAF) and abnormal origin of coronary artery (AOOCA).MethodsFrom January 2014 to June 2018, with the assistance of virtual reality technology, 4 patients with CAF and 4 patients with AOOCA in the Department of Cardiac Surgery of our hospital underwent treatment method deciding and operation details planning. In the CAF patients, there was 1 male and 3 females and they were 8 years, 16 years, 62 years, and 65 years, respectively. In the AOOCA patients, there was 1 male and 3 females at age of 4-month, 2 years, 14 years, and 29 years, respectively.ResultsThe virtual heart models in all 8 patients were well matched with the real heart. The spatial structure information of CAF/AOOCA and surroundings can be intuitively and fully shown by virtual reality technology in all patients. All of the 4 CAF patients repaired coronary artery incision, including 2 patients with autologous pericardium patch and 2 patients with direct suture. Of the 4 AOOCA patients, 3 underwent coronary directly transplantation but 1 underwent Takeuchi surgery. And 2 had mitral valve plasty at the same time. All the operations were completed successfully, with good recovery and no serious complications. Among the 4 CAF patients, 3 had no residual fistula, and 1 had minor residual fistula. Coronary arteries were all unobstructed in 4 patients of AOOCA; moderate and severe mitral regurgitation in 2 patients were significantly reduced after surgery.ConclusionVR allows doctors to understand the spatial structure information of CAF/AOOCA and surroundings before the operation, and assists them to make accurate treatment decisions and develop detailed surgical plans before the operation, ensuring its safety. Its clinical application value is significant.
ObjectiveTo research the value of virtual reality (VR) technology in the preoperative planning of transtrochanteric curved varus osteotomy for avascular necrosis of the femoral head (ANFH) in adults.MethodsBetween June 2018 and November 2018, 7 patients (11 hips) with ANFH, who were treated with transtrochanteric curved varus osteotomy, were enrolled in the study. There were 4 males (7 hips) and 3 females (4 hips) with an average age of 31.9 years (range, 14-46 years). Among them, 3 patients were unilateral ANFH and 4 patients were bilateral ANFH. There was 1 patient (1 hip) of traumatic ANFH, 2 patients (4 hips) of alcohol-induced ANFH, 2 patients (3 hips) of hormonal ANFH, and 2 patients (3 hips) of idiopathic ANFH. All hips were Association Research Circulation Osseous (ARCO) stage Ⅲ. There were 5 hips for Japanese Investigation Committee (JIC) type C1 and 6 hips for type C2. There were 5 hips for China-Japan Friendship Hospital (CJFH) type L1,1 for type L2, and 5 for type L3. The disease duration ranged from 5 to 12 months (mean, 8 months). Preoperative Harris score was 53.91±7.66. The neck-shaft angle ranged from 128 to 143° (mean, 133.9°). VR technology was adopted for the preoperative planning. CT data were imported into the software to construct the morphology of necrotic area, and the transrtrochanteric varus osteotomy was simulated. The varus angle was designed according to the integrity rate of femoral head. The planned varus angle was 6 to 16° (mean, 9.7°). The transtrochanteric curved varus osteotomy was performed according to the preoperative planning, and the varus angle and loading area were confirmed under fluoroscopy. If the planned varus angle was too small, it would continue to increase under the fluoroscopy until a satisfactory varus angle. Postoperative changes of the neck-shaft angle were calculated and compared with the preoperative planned varus angle (error). The hip function was assessed by using the Harris score.ResultsAll incisions healed by first intention. All patients were followed up 6-11 months with an average of 8 months. The X-ray film at 2 days after operation showed that the neck-shaft angle was 112-135° (mean, 123.4°). The difference of the neck-shaft angle between pre- and post-operation was 6-16° (mean, 11.0°). Among them, the difference of the neck-shaft angle was consistent with planned varus angle in 5 hips, while the error of the remaining 6 hips was 1-4°. There was 1 patient (1 hip) of osteotomy nonunion at 4 months after operation, 1 patient (1 hip) of proximal femur fracture at 2 months after operation. The rest 5 patients (9 hips) obtained union at the osteotomy. At last follow-up, the Harris score was 82.18±16.35, showing significant difference when compared with preoperative score (t=–5.195, P=0.000).ConclusionVR technology is a brand-new preoperative planning method for transtrochanteric curved varus osteotomy in treating ANFH.
Objective To explore the feasibility of virtual reality (VR) technology combined with reduction plasty of the femoral head in the treatment of coxa plana and evaluate its effectiveness. Methods Three patients with coxa plana were selected as the research objects between October 2018 and October 2020, all of them were male, aged 15-24 years. Preoperative surgical planning was performed using VR technology; 256 rows of CT data of hip joint were imported into software to generate three-dimensional (3D) imaging, simulate the surgical process, and determine the matching relationship between the femoral head and acetabulum. According to the preoperative planning, reduction plasty of the femoral head under surgical dislocation, relative lengthening of the femoral neck, and periacetabular osteotomy were performed. The reduction of osteotomy size of femoral head and rotation angle of acetabulum were confirmed by C-arm fluoroscopy. The healing of the osteotomy were assessed by radiological examination after operation. The Harris score of hip function and visual analogue scale (VAS) score were recorded before and after operation. The femoral head roundness index, center-edge (CE) angle, and femoral head coverage were measured by X-ray films. ResultsThree operations were completed successfully, and the operation time was 460, 450, and 435 minutes, and the intraoperative blood loss was 733, 716, and 829 mL, respectively. All patients were infused with 3 U suspension oligoleucocyte and 300 mL frozen virus inactivated plasma after operation. No postoperative complication occurred, such as infection and deep vein thrombosis. Three patients were followed up 25, 30, and 15 months, respectively. CT showed good healing of the osteotomy at 3 months after operation. The VAS score and Harris score at 12 months after operation and at last follow-up, as well as the femoral head rounding index, hip CE angle, and femoral head coverage at 12 months after operation significantly improved when compared with those before operation; the hip function was evaluated by the Harris score at 12 months after operation, and all three patients were good. ConclusionVR technology combined with reduction plasty of the femoral head can achieve satisfactory short-term effectiveness in the treatment of coxa plana.
Emotion recognition refers to the process of determining and identifying an individual's current emotional state by analyzing various signals such as voice, facial expressions, and physiological indicators etc. Using electroencephalogram (EEG) signals and virtual reality (VR) technology for emotion recognition research helps to better understand human emotional changes, enabling applications in areas such as psychological therapy, education, and training to enhance people’s quality of life. However, there is a lack of comprehensive review literature summarizing the combined researches of EEG signals and VR environments for emotion recognition. Therefore, this paper summarizes and synthesizes relevant research from the past five years. Firstly, it introduces the relevant theories of VR and EEG signal emotion recognition. Secondly, it focuses on the analysis of emotion induction, feature extraction, and classification methods in emotion recognition using EEG signals within VR environments. The article concludes by summarizing the research’s application directions and providing an outlook on future development trends, aiming to serve as a reference for researchers in related fields.
Objective To explore the application effect of virtual reality (VR) technology in low vision teaching for optometry students. Methods Undergraduate students majoring in optometry at West China School of Medicine of Sichuan University were selected as the research subjects. The students enrolled in 2020 adopted the traditional lecture-based learning (LBL) teaching mode (LBL teaching group), while the students enrolled in 2021 adopted the VR teaching mode (VR teaching group). Both groups of students studied the content of the same chapter on low vision, completed in-class tests after learning, and completed a questionnaire survey. Results There were 28 students in the VR teaching group and 30 students in the LBL teaching group. There was no statistically significant difference in age or gender composition between the two groups of students (P>0.05). The in-class test scores of students in the VR teaching group were higher than those in the LBL teaching group (86.43±6.10 vs. 78.10±7.69, P<0.05). Except for “subjective discomfort with this teaching mode”, the differences in other evaluation results between the two groups were statistically significant (P<0.05). VR teaching group students generally believed that applying VR technology to low vision teaching helped understand the visual experience and daily life status of low vision patients, improved learning efficiency and hands-on ability, reduced learning burden, and hoped to use this teaching mode routinely in other subject teaching. All students in the VR teaching group believed that this teaching mode was interesting, highly innovative, and enhanced teacher-student interaction.Conclusions Applying VR technology to low vision teaching can enable students to personally experience the impact of various diseases on patients’ visual function and daily life. This teaching method not only optimizes and improves teaching effectiveness, but also has a high acceptance rate among students, which is worth further promoting in future optometry teaching.