Three-Dimensional Reconstruction Algorithm of Computed Tomography Imaging for Surgical Treatment and Rapid Rehabilitation Nursing of Renal Cell Carcinoma

-is study was carried out to explore the promotion role of computed tomography (CT) imaging three-dimensional (3D) reconstruction technology and rapid rehabilitation nursing intervention (RRNI) in the treatment of patients with renal cell cancer (RCC) laparoscopic radical nephrectomy (LRN) in view of the patient’s condition. 98 RCC patients who were admitted to the hospital from July 2019 to July 2020 were selected as the research subjects, and all patients underwent the LRN and the RRIN. Of which, 46 RCC patients were scanned with CT images (regarded as the CT group), and 46 RCC patients were scanned with CT images based on 3D reconstruction algorithms (regarded as the 3D CT group). -e clinical efficacy and the life quality, pain degree, and adverse mood changes before and after the RRN were analyzed and compared. -e results showed that the surgery time in the 3D CT group and the CT group was 130.2± 42.8 minutes and 162.4± 38.5 minutes, respectively (P< 0.05). -e recurrence rate of RCC in both groups was 0%.-e estimated blood loss in the 3D CTgroup and the CTgroup was 93.6± 35.5mL and 90.3± 40.2mL, respectively; the complication rate in the 3D CTand CTgroup was 5% and 12%, respectively; the hospital stay in the 3D CT and CT group was 12.5± 4.7 days and 12.1± 3.2 days, respectively, which had no statistical significance (P> 0.05). -e scores of visual analogue scale (VAS), 36-Item Short-FormHealth Survey (SF-36), self-rating depression scale (SDS), and selfrating anxiety scale (SAS) of patients in the two groups were statistically significant (P< 0.05). It indicated that CTimages based on the 3D reconstruction algorithm could be applied in LRN of RCC patients to shorten the surgery time and improve the surgical effect, and implementation of the RRN could relieve the adverse mood of RCC patients and effectively improve their life quality.


Introduction
As a kind of urinary system tumor, kidney tumor usually can be divided into benign and malignant tumor [1]. Of which, malignant tumor accounts for a relatively large proportion and can usually be divided into many types such as RCC, renal cell tumor, and renal metastasis [2]. RCC, also known as renal cancer, is the most common renal parenchymal malignant tumor. Patients suffering from RCC account for about 80%-90% of all renal malignancies. RCC is more often in people aged 50-60, most of who were male [3]. At present, the incidence and fatality rate of RCC all over the world are showing a significant increase trend. LRN is the first choice for the treatment of RCC, and it can also be applied to patients with clinical stage II and partial nephrectomy, so it is widely applied in the clinical treatment of RCC [4,5]. Currently, LRN has been widely recognized by more and more urologists and patients. LRN is superior to the open surgery in terms of shorter hospital stay and lower pain degree of patients after surgery, and it can reduce the financial pressure of the patient. LRN surgery can generally be divided into two approaches: transabdominal and retroperitoneal approach.
e transabdominal approach has a larger abdominal operation space and a strong 3D effect, but it is easily interfered by abdominal organs. Although the operation space of the retroperitoneal approach is relatively small, it is not interfered by abdominal organs, is easy to expose, and has no risk of contamination. us, it is currently a clinical hot research topic [6]. LRN through the retroperitoneal approach can more intuitively and clearly show the renal artery so that it is easy for the surgery, but the operating space is relatively narrow, and the relationship among the adjacent organs is very close. erefore, how to accurately locate and handle the renal pedicle vessels is of important significance for LRN through the retroperitoneal approach.
Imaging techniques for renal tumor diseases include ultrasound, CT, and magnetic resonance imaging (MRI) [7,8]. Ultrasound is usually only capable of preliminary diagnosis and qualitative analysis and is the main method of renal tumor screening. CT imaging can diagnose the benign and malignant kidney tumors and can also determine its clinical stage. MRI is similar to CT in terms of diagnostic functions. With the development of medical imaging technology and the concept of "precision surgery," twodimensional images can no longer meet the current requirements. In recent years, 3D reconstructed images drawn by the built-in software of CT instruments have shown more and more advantages and can show the 3D anatomical structures of kidney tumors and renal pedicles clearly. Wake et al. found that cognitive renal tumors based on CT and MRI data were poorly localized, and 3D reconstruction models could improve the accuracy of tumor localization and may provide assistance through appropriate surgical methods [9]. erefore, the feasibility and prospects of 3D CT reconstruction imaging technology in the diagnosis and treatment of renal tumors are very promising. RRNI is a comprehensive nursing technology that combines multiple disciplines such as nursing and nutrition. It can adopt a series of optimized measures during the perioperative period with evidence-based medical evidence. In addition, it can reduce or block the stress response of patients during the perioperative period through the multidisciplinary cooperation of surgery, anesthesia, nursing, and nutrition. us, it can promote the recovery of surgical patients as soon as possible and fully improve the postoperative physiological state. erefore, it has already played an important role in the surgical treatment of colorectal cancer, esophageal cancer, and other diseases [10].
Based on the advantages of the 3D reconstruction algorithm, 3D reconstruction technology was applied for 3D reconstruction of the patient's CT image data and utilized to the LRN and RRN of RCC patients to explore the clinical efficacy and the life quality, pain degree, and adverse mood of the patients before and after the nursing. is study was to provide an important basis for the optimal selection of clinical treatment and surgical plans and subsequent nursing interventions for RCC patients.

Research
Objects. 98 RCC patients who were admitted to hospital from July 2019 to July 2020 were selected and treated with LRN. Among them, 46 patients were scanned with CT images (CT group), and 46 patients were scanned with CT images based on 3D reconstruction algorithms (3D CT group). ere were 30 males and 16 females in the CT group and 28 males and 18 females in the 3D CT group. is experiment had been approved by the Ethics Committee of the Hospital, and all the patients included had understood the experiment fully and signed informed consent. e inclusion criteria were defined as below: patients performed with CT examination; patients who were diagnosed as RCC by pathological results; patients without abnormal heart or lung function; patients without history of abdominal surgery; and patients with normal blood coagulation function. e exclusion criteria could be determined as follows: patients who were contraindicated in LRN; patients who were allergic to contrast agents; and patients with underlying diseases related to LRN.

CT Image Scanning Based on 3D Reconstruction
Algorithm.
e CT contrast agent referred to an isotonic contrast agent iodixanol. e patients were required to fast for 4 hours before the examination. In order to avoid artifacts caused by breathing motion to interfere with the image, the patients were allowed to drink 500-1,000 mL of water half an hour before the examination and 500 mL of water again before the CT examination. e tube voltage was set to 120 kV, the tube current was set to 300 mA, the layer thickness was 5 mm, and the pitch was 0.984. e patient was in the supine position and performed a CT scan from the level of the xiphoid process to the level of the symphysis pubis.
e preoperative planning and intraoperative guidance of the CT group were realized by using the two-dimensional CT scan images and the computed tomography angiography (CTA) and computed tomography urography (CTU) equipped for the instrument. Preoperative planning of the 3 D CT group was realized using the Mimics 17.0 software for CT image segmentation and 3D reconstruction, and a 3D reconstruction model of the kidney was constructed to realize the simulated positioning of renal pedicle vessels, and the possible intraoperative damage or vascular leakage was predictively analyzed. In addition, the intraoperative guidance was realized through 3D reconstruction models and artificial fusion images for positioning guidance. e CT images were segmented with the threshold segmentation algorithm (TSA) and region growing algorithm (RGA). e 3D reconstruction algorithm of CT image based on the Mimics platform is for image reconstruction. e Mimics software was used to generate and edit the 3D images. Data of all kinds of equipment such as CT and MRI could be imported. e 3D model was constructed with the image segmentation and registration fusion technology. After modification, the imported data could be outputted in computer-aided design (CAD) or rapid prototyping (RP) format.

Quality Assessment of the 3D Reconstructed CT Image.
Two urologists and radiographers with more than 5 years of experience were selected to evaluate the quality of 3D reconstructed CT images. e scoring standards are shown in Table 1.

LRN Treatment.
LRN was performed through a retroperitoneal approach. e patient was preoperatively waterfree and fasted, the enema and the skin were cleaned, urinary catheters were indwelled, and endotracheal intubation was performed under general anesthesia. e patient was placed in a lateral position with raised waist bridge, lowered head, and lower limbs and then disinfected. e incision (approximately 2 cm) was cut at the edge of the 12th rib of the posterior axillary line, and the muscle and the posterior peritoneal space were separated. A glove air bag containing 700 mL of air was placed and retained for 180 seconds, and then the air was exhausted and the air bag was taken out. A transverse incision (1.5 cm in size) was cut above the midaxillary iliac crest; the index finger was allowed to deepen into the posterior abdominal cavity from the incision to insert the 12 mm trocar carefully. e anterior axillary line was cut below the costal margin for approximately 0.5 cm, a 5 mm trocar was inserted in the same way as the previous operation, and then a 12 mm trocar was placed below the edge. e pneumoperitoneum was slowly established, and a laparoscope was placed. After the retroperitoneal fat was removed, blunt separation was performed in the prerenal fascia, posterior fascia, and psoas major with an ultrasonic knife. en, the renal artery and renal vein were separated. e ligation and separation were realized with the Hem-olok to free the ureter. e pararenal space was enlarged, the kidneys and fat sacs were cut, and the bleeding was stopped through electrocoagulation with a PK cutter. e drainage tube was placed to a depth of 20 cm and drawn out from the incision at the midaxillary iliac spine, and the trocar was taken out. Finally, the incision was sutured to finish the surgery.

Rapid Rehabilitation Nursing
Intervention. RRN was for intervention treatment. e pain and life quality of patient during hospitalization were evaluated using the VAS score [11] and the SF-36 scale [12], and changes in the adverse mood were evaluated using the SDS scale [13] and SAS scale [14]. e RRN was realized by the following modes before, during, and after the LRN. Before LRN, health education was given to patient after admission, so that he could fully understand the disease and nursing implementation plan and actively cooperate with medical staff; the emotional state of the patient was closely focused on to help the patient establish a good state of mind; the patient was informed of preoperative dietary precautions, which included fasting for 6 hours and no drinking water for 2 hours; in addition, the patient was required to take 800 mL of 10% glucose solution before 8 o'clock in the evening before surgery. During LRN, the emotional state of the patient was concerned, and positive comfort was given; the temperature in the operating room was controlled reasonably at 20-25°C; corresponding measures could be taken to heat the infusion and washing solution if necessary; and mattresses could also be adopted to keep warm and ensure good insulation measures for the patient. After LRN, the changes in the psychological state of patient was closely concerned, and necessary psychological counseling could be provided according to the actual situation; the patient was supervised to take medications on time and given with detailed medication guidance, and dietary guidance, including warm water, was allowed 6 hours after surgery and a small amount of liquid food could be taken after 1 day, and then semiliquid food and normal diet could be allowed according to the recovery situation; the families were supervised to help move the patient's limbs, help the patient on bed exercises such as deep breathing, and try to get out of bed according to the situation the next day; the state of the patient's urine was observed, the urine bag was changed frequently, and the drainage tube was removed as soon as possible; the patient was informed of the principle of daily diet and avoiding strenuous exercise before leaving the hospital, and appropriate medication guidance was provided; and the patient's condition was asked for promptly and the timely follow-up visit was guaranteed.
2.6. Statistical Analysis. SPSS 20.0 statistical software was employed for analysis. Measurement data were indicated as mean ± standard deviation ('x ± s), and the count data were expressed as percentage (%). e two groups of patients were compared by t-test in gender, age, body mass index (BMI), American Society of Anesthesiologists (ASA) score, tumor location, tumor maximum diameter, accessory renal artery, and hemoglobin. e operation time, intraoperative blood loss, hospital stay, follow-up time, blood transfusion rate, complication rate, and tumor recurrence rate were

Analysis of 3D Reconstruction Effect of the CT Image.
e image reconstruction for patients in 3D CT group was realized by 3D reconstruction algorithm of CT image based on the Mimics platform, so that the tumor location and depth, structure characteristics of renal pedicle vascular, and variant anatomy could be shown clearly and intuitively (Figure 1). e image 3D reconstruction, preoperative planning, and intraoperative guidance were realized successfully through the Mimics 17.0 software in the 3D CT group. For the patients in CT group, the CT scan data was utilized for surgical planning and intraoperative guidance, and the LRN surgery was also successful.
In the 3D CT group, the 3D CT image of the renal pedicle vessels of 48 RCC patients were assessed, and the results are shown in Table 2. ere were 3 cases in 1 score, 28 cases in 2 scores, and 17 cases in 3 scores among the renal vein images; and there were 4 cases with 2 scores, 4 cases with 3 scores, 30 cases with 4 scores, and 10 cases with 5 scores among the renal artery. A total of 46 cases of 3D image models were effectively and completely evaluated. ere was 1 image with incomplete completeness of the model due to insufficient contrast agent, but the characteristics of the renal vein/arterial trunk were still clearly displayed, so the surgery was not affected accordingly. In summary, the effectiveness of reconstructed CT images based on 3D reconstruction algorithms reached 95.9%.

Clinical Information of Patients with Renal Cell
Carcinoma.
e differences between the two groups of patients in gender, age, BMI, ASA score, tumor location, tumor maximum diameter, accessory renal artery, and hemoglobin were not statistically meaningful (P < 0.05), as shown in Table 3.

Analysis of Clinical Efficacy.
e average surgery time of patients in the 3D CT group was 130.2 ± 42.8 minutes, which was obviously shorter than that of the CT group (162.4 ± 38.5 minutes) (P < 0.05); the estimated blood loss of patients in the 3D CT group and the CT group was not greatly different, which was 93.6 ± 35.5 mL and 90.3 ± 40.2 mL, respectively (P > 0.05), as shown in Figure 2.
e hospital stays and follow-up time between the two groups were compared and analyzed, and the results are shown in Figure 3. It revealed that the hospital stay (12.5 ± 4.7 days and 12.1 ± 3.2 days, respectively) and the follow-up time (4.6 ± 2.5 months and 5.8 ± 2.7 months, resp.) in the 3D CT group and the CT group had no statistically meaningful difference (P > 0.05). e pathological results of both groups were determined as RCC both. In the 3D CT group, the intraoperative blood transfusion rate was 16%, the complication rate was 5%, and the tumor recurrence rate was 0%, and the above indicators in the CT group was 21%, 12%, and 0%, respectively. ere was no observable difference in the blood transfusion rate, complication rate, and tumor recurrence rate between the two groups (P > 0.05), as shown in Figure 4.
ere was no statistical difference between 3D CT group and CT group in terms of postoperative hemoglobin (114.56 ± 13.28 g/L vs. 108.63 ± 16.38 g/L) and hemoglobin change (15.73 ± 10.57 g/L vs. 18.37 ± 14.32 g/L) (P > 0.05), as illustrated in Figure 5. Figure 6, the patient's VAS score and SF-36 score before intervention was 3.91 ± 0.45 points and 92.54 ± 9.43 points, respectively; and they were 2.21 ± 0.32 points and 110.54 ± 10.53 points, respectively, after intervention. Among them, the VAS score of patients after intervention was obviously lower than that before intervention, while the SF-36 score after intervention was much greater than the score before intervention, and the difference was statistically significant (P < 0.05). Figure 7 reveals that the SDS score and SAS score of patients before and after the intervention were 58.46 ± 8.51 scores vs. 43.08 ± 8.13 scores and 54.97 ± 10.31 scores vs. 47.82 ± 7.92 scores, respectively (P < 0.05).

Discussion
e probability of renal pedicle vascular mutation in the kidney of patients with malignant tumors is generally higher than that of the normal population, which increases the complexity of the surgery to a certain extent. e key part of LRN is the precise positioning and treatment of renal pedicle vessels. Studies have shown that the 3D reconstruction model of the kidney can accurately and objectively display the renal arteries and veins as well as other tissue structures clearly [15]. Huang et al. used the Urmedix-3D system to reconstruct the 3D CT structure of human kidneys and renal lesions. e results showed that the reconstructed 3D model can objectively evaluate the spatial anatomical relationship of the lesions, thereby providing help for surgical planning [16].
is article uses a 3D reconstruction algorithm to process CT images, which can clearly see the patient's tumor location and depth, and renal pedicle vascular structure characteristics, indicating that this algorithm can improve the accuracy of CT image detection results and help identify renal pedicle vascular information.
is provided an information reference for doctors to develop personalized treatment plans for patients and even follow-up LRN operations.
In this paper, the operation time of 3D CT group was 130.2 ± 42.8 (min), which was less than 162.4 ± 38.5 (min) of CT group, P < 0.05; the complication rate of 3D CT group was 5% and that of CT group was 12%. It shows that 3D CT reconstruction images can shorten the operation time and improve the surgical effect in LRN surgical treatment. Hu et al. found that 3D spatial CT measurement of anatomical structures can help improve the accuracy of LPN performance and reduce the warm ischemia time compared with traditional CT measurement [17], which was similar to the results of this study; the difference between this study and Hu et al.'s lied in that there was an obvious difference in warm ischemia time (26.7 ± 6.4 vs. 31.9 ± 7.0 minutes) and tumor resection time (8.4 ± 2.6 vs. 10.4 ± 2.8 minutes), but there was no considerable difference in surgery time between the CT and 3D CT group, which maybe because that research object of Hu et al. was LNP patients diagnosed with T1 renal mass, which was different from the research object of this study. Wang et al. [18] compared the effectiveness and safety of routine CT examination and individualized 3D visualization technology (3D VT) in the surgical planning and perioperative effects of LPN treatment for RCC and found         6 Scientific Programming quality of patients, and had positive significance for subsequent rehabilitation.

Conclusion
In this study, 98 RCC patients were divided into a CT group (two-dimensional CT image) and a 3D CT group (3D CT image reconstruction), and all received the RRNI. e results showed that 3D CT reconstruction images greatly shortened the surgery time and improved the surgical effect in the LRN of RCC patients. RRN could alleviate the adverse mood of patient and effectively improve the life quality. However, the number of samples in this study was limited, and individual patient differences had greater impacts on the surgical process and results. In the follow-up, it was necessary to increase the number of samples and increase the analysis of other intraoperative or postoperative observation indicators and further explore the impacts of CT imaging technology based on 3D reconstruction algorithms on the efficacy of LRN in patients with RCC. In short, the results of this study could provide a reliably theoretical basis for improving the efficacy of LRN for patients with RCC and for the research on nursing intervention.

Data Availability
No data were used to support this study.