ABSTRACT
Objective:To explore the clinical effect of repairing interphalangeal joint defect of hand with free transfer of part of the 2nd metatarsophalangeal joint tissue flap precisely cut with the aid of digital 3D printing technology.Methods:From December 2016 to December 2020, 7 patients with partial joint defects of proximal interphalangeal joints of fingers were treated in Department of Hand and Foot Surgery, Shunde Hospital Affiliated to Guangzhou Medical University(Foshan Shunde Lecong Hospital). Before surgery, three-dimensional data of hand and foot bones were collected, and the 3D printing model was used to simulate the operation in vitro. During the operation, the first dorsal metatarsal artery-the 2nd dorsal metatarsal artery was used as the pedicle, and the 2nd metatarsophalangeal joint composite tissue flap with a required size was harvested with the assistance of the navigation template to tranfer and repair the small joint defects of hand. All 7 cases entered follow-up at outpatient and telephone. Results:All 7 cases survived. Postoperative follow-up was 3-24(mean 9.5) months, Range of motion of the repaired interphalangeal joint was (56 ± 6)°; According to the Evaluation Standard of Thumb and Finger Reconstruction Function of the Society of Hand Surgery of the Chinese Medical Association, 2 cases were excellent, 4 cases were good, and 1 case was poor.Conclusion:Transfer of the free 2nd metatarsophalangeal joint tissue flap assisted by 3D printing technology in repair of the small joint defect of the hand can accurately harvest the tissue flap, which is clinically reliable.
ABSTRACT
Objective: To explore the value of quantitative parameters of dual-energy CT arterial iodine map for differentiating nasal and paranasal sinus mass-like polyps from tumors. Methods: Dual-energy CT data of 80 patients with nasal sinus masses confirmed by surgical pathology were retrospectively analyzed. According to pathological results, the patients were divided into polyp group (n=26), benign tumor group (n=24) and malignant tumor group (n=30). Arterial phase iodine concentration (IC), normalized iodine concentration (NIC) and iodine map CT value (Overlay value) of lesions were measured, calculated and compared among 3 groups. Then patients in benign tumor group and malignant tumor group were combined into tumor group (n=54). ROC curves of each quantitative parameters of arterial phase iodine map for differentiating nasal and paranasal mass polyps and tumors were drawn, and the relative diagnostic efficacy were evaluated. Results: The arterial phase IC, NIC and Overlay value of benign tumor group (H=-4.13, -2.80, -4.00) and malignant tumor group (H=-7.02, -5.75, -6.12) were all higher than those of polyp group (all P<0.05). The arterial phase IC and NIC in malignant tumor group were higher than those in benign tumor group (H=-2.60, -2.73, both P<0.05), while Overlay value showed no statistical difference between benign and malignant tumor groups (H=-1.85, P=0.20). AUC of arterial phase IC (0.95) for differentiating nasal and paranasal mass polyps and tumors was larger than that of NIC (0.85) and Overlay value (0.91). Taken 1.15 mg/ml as the diagnostic threshold, the diagnostic sensitivity, specificity and Youden index was 81.50%, 96.20% and 78.00%, respectively. Conclusion: Arterial phase iodine-related quantitative parameters of dual-energy CT have certain application value in differential diagnosis of nasal and paranasal sinus mass-like polyps and tumors.
ABSTRACT
To resolve the problems of relativity translation variant and relativity rotation variant existed in the two medical images, combining the removing characteristics and rotating characteristics in image signal Fourier transform, a method of medical image registration combining with frequency domain and time domain is put forward based on the well-known Fourier property. The method decouples the estimation of rotation and translation. It determines rotation parameters based on amplitude spectrum correlation in frequency domain and estimation translation parameters based on intensity value correlation in time domain. The experimental results of nuclear medical image registration and multi-modality medical image registration show that this method is a very robust and fast registration method with high accuracy.