ABSTRACT
Objective:To investigate the effect of ultrasonic debridement mediated by 0.9% sodium chloride solution and 0.5% iodophor volt combined with eddy current washing and high pressure pulse washing on the removal of colonized bacteria on the wound surface of diabetic foot and wound healing.Methods:From March to November 2020, a total of 60 patients using ultrasonic therapy for debridement were divided into control group, experimental group 1, experimental group 2 and experimental group 3 by random digit table in the fourth People′s Hospital of Dalian. The final effective data collected was 15 cases in each group. The control group was given ultrasonic debridement mediated by 0.9% sodium chloride solution and eddy current washing.Experimental group 1 was given ultrasonic debridement mediated by 0.9% sodium chloride solution and high pressure pulse washing. Experimental group 2 received 0.5% iodophor mediated ultrasonic debridement and eddy current washing. Experimental group 3 0.5% iodophor mediated ultrasonic debridement and high pressure pulse washing. The size of the wound was measured, sampled and bacterial cultured before and after the first, fifth and 10th intervention. The wound bacterial clearance rate and wound area reduction rate were calculated and compared.Results:Before and after 3 interventions, the bacterial clearance rate and the total reduction of wound surface in 4 groups were increased ( P<0.01), the total bacterial clearance rate of experimental group 3 was the highest, which was (93.85 ± 9.87)%.The total reduction rate of wound in experimental group 2 was the highest, which was (20.831 4 ± 9.379 8)%. Conclusions:0.5% iodophor mediated ultrasonic debridement combined with high pressure pulse washing is the most effective way in the removal of diabetic foot wounds, and 0.5% iodophor solution mediated ultrasonic debridement combined with eddy current washing is the most effective in reducing diabetic foot wounds.
ABSTRACT
Objective: To purpose an effective solution of reducing MRI time when rapid change and gradient switching rate of gradient magnetic field are restrained by eddy current caused by self induction and mutual inductance of gradient coil in MR system. Methods: With the constraints of gradient inductance minimization and gradient magnetic field self-shielding, a mathematical model was established by combining the target field point method to solve the winding distribution of the double-plane gradient coil, so as to reduce the magnetic field energy of the gradient coil and the eddy current on the performance of the gradient coil. At the same time, in order to shorten the operation time of solving the above complex mathematical model matrix by MATLAB software, graphic processing unit (GPU) acceleration algorithm was used to realize the calculation of gradient coil. Results: By minimizing gradient inductance, eddy current effect could be effectively reduced, the magnetic field self-shielding could be realized, the gradient switching rate was good, and the overall performance of the gradient coil could be improved. Conclusion: The new target field point method for biplane gradient coil is effective and feasible, which can realize minimization of gradient inductance and designing self-shielding gradient coil of gradient magnetic field.
ABSTRACT
Eddy current is one of the most important factors that influence image quality during the process of magnetic resonance imaging. This paper analyzes the reason that eddy current appears and introduces several methods to compensate it. A new method to adjust parameters of eddy current compensation is developed, which proves efficient to enhance image quality through XGY OPER-0.3 MRI system.