RESUMO
Objective To investigate the feasibility and accuracy of three-dimensional ultrasound-ultrasound(3DUS-US)fusion imaging based on electromagnetic positioning in the assessment of ablation zone of liver tumor through experimental study in phantom models.Methods Sixteen phantom models which could be ablated and used to assess the ablation zone were established.Then,they were ablated and divided into complete ablation group(n =8)and incomplete ablation group(n =8)randomly.Their ablation effects were assessed by 3DUS-US fusion imaging.If the tumor model was assessed as incomplete ablation,the maximum thickness of the residual tumor was measured.The assessments of gross specimen were used as golden standard to validate the feasibility and accuracy of assessment of 3DUS-US fusion imaging.The success rate of registration,duration time of fusion imaging,accuracy rate of assessment and measurement error in incomplete ablation group were recorded.Results All of the 16 phantom models were produced successfully.The success rate of registration was 100% and the duration time of 3DUS-US fusion imaging was(3.9±1.0)min.The accuracy rate of assessment was 100%.There was no significant difference between the assessment of residual tumor thickness in incomplete ablation group by 3DUS-US fusion imaging and gross specimen(t=-0.814,P =0.442),and the measurement error was(1.1±0.6) mm.Conclusions 3DUS-US fusion imaging based on electromagnetic positioning is a feasible,accurate and convenient method in the assessment of ablation zone of liver tumor.It would be a new immediate precise assessment method during ablation procedure for liver tumor.
RESUMO
Objective To compare the accuracy,convenience and repeatability of 3DUS-US and CT-US image fusion technology based on electromagnetic positioning.Methods A tissue-mimicking phantom was established and used to obtain ultrasound or CT volume images.Two different operators performed 3DUS-US and CT-US image fusion and repeated 10 times,respectively.The success rate,the registration error distance and fusion time of two techniques were recorded and compared between the different operators.Results The ultrasound and CT images of the phantom and its stability could meet the demands of this experiment.3DUS-US and CT-US image fusions were successful.The registration error distance of 3DUS-US image fusion was (1 .70 ± 0.42)mm and fusion time was (76.00 ± 9.99)s,they were obviously superior to CT-US (P = 0.014,P < 0.001 ).There were no significant differences between the two operators in the registration error distance and fusion time of 3DUS-US (P =0.508,P =0.5 1 7).But the registration error distance of CT-US image fusion in experienced operator was lower than the junior (P =0.009),and fusion time had not statistical difference between the two operators (P =0.234).Conclusions The technique of 3DUS-US automatic image fusion based on electromagnetic positioning has advantages of convenience and no experiential dependence comparing with CT-US in the phantom experiments,so it is worthy of being widely popularized in clinical application.
RESUMO
Objective To evaluate the feasibility and accuracy of three-dimensional ultrasound-ultrasound (3DUS-US)automatic image fusion technology based on electromagnetic positioning.Methods The experimental phantom was constructed to acquire ultrasonic images by agarose gel and additives,which was used as the experimental object.3DUS imaging with free-hand and real-time ultrasound imaging automatic registrations were performed based on electromagnetic positioning.To investigate the effect of 3DUS-US image fusion under different scanning speed by free-hand,the fast and slow groups were designed. In addition,a junior operator and a senior operator performed 3DUS-US automatic registrations,and recorded the operating time and registration error,respectively.The repeatability between two operators was analyzed.Results The macroscopic appearance,stability and ultrasonic image of the phantom met the demand of this research.The success rate of 3DUS-US automatic image fusion technology was 100%(40/40).The slow group's registration error distance was (1 .44 ± 0.64)mm,which was obviously lower than the fast group's (2.56±0.53)mm,the difference was statistically significant (P <0.001).There were no statistically differences of the registration error and operating time between the two operators (P =0.508,P = 0.5 1 7 ).Conclusions The technology of 3DUS-US automatic registration based on electromagnetic positioning was feasible and accurate,which is worth applying into the clinical treatment.
RESUMO
Objective:For clinical interventional procedures in surgery,blind spot, as well as minimally invasive surgery more precise surgical navigation requirements, this paper explores the use of a new generation of Aurora electromagnetic tracking technology assisted surgical navigation through free combination with a variety of surgical instruments, surgical further addressed various problems encountered. Methods:Aurora electromagnetic tracking system used with metal-containing material that matches the medical surgical environment, the use of electromagnetic tracking system comes with control software, the use of which is equipped with the SDK (secondary development package), I use a set of VC programming language suitable for clinical surgical navigation, real-time display system, and in our hospital different medical surgical navigation application performance test and comparative experiments measured the accuracy of the tracking system, the statistics of various surgical instruments corresponding to different surgical applications. Results:By author in Jingzhou City, First People's Hospital conducted a series of clinical application, verify the advantages of the system, allows doctors during surgery even more powerful, fully reflects the Aurora electromagnetic tracking system, superior performance, as well as in the medical surgical navigation important far-reaching significance. Conclusion:By using a variety of surgical instruments and medical surgical navigation in different experiments, we found that Aurora electromagnetic tracking system surgery centimeter-level positioning accuracy can be changed from the millimeter level, navigation accuracy average of less than 2 mm, and is available for user secondary development package, free easy programming operation, combined with surgical instruments and flexible, easy to implement intelligent navigation surgery. For clinical work provides an updated, more broad application space, enhancing the overall surgical navigation accuracy and controllability.
RESUMO
Objective In order to meet the needs of more precise surgical navigation during interventional procedures and minimally invasive surgery, Aurora electromagnetic tracking technology-assisted surgical navigation with free combination of various surgical instruments was tested, trying to further solve problems encountered in surgery. Methods Aurora electromagnetic tracking system was used to match the medical surgical environment with metal-containing material. The built-in control software in this electromagnetic tracking system, which was equipped with the software development kit, was used to write a set of VC programming language suitable for real-time display of clinical surgical navigation system, and relative performance tests and comparative experiments were conducted for different medical surgical navigation application in the hospital to measure the precision degree of the tracking system, as well as the statistics of various surgical instruments corresponding to the application in different surgeries. Results 160 patients in interventional surgery with coronary angiography were randomly selected, 80 patients treated by digital subtraction angiography(DSA) with electromagnetic tracking systems as the experimental group, and 80 patients by DSA only as the control group. It was found out that with obviously less operating time, the amount of contrast agent was significantly reduced in the experimental group, and the degree of controllability for interventional surgical procedure was increased from 95% success rate to 99%. Conclusions The comparative experiments proved that Aurora electromagnetic tracking technology could significantly improve the accuracy in surgery, with the mean value of navigation less than 2 mm. In terms of interventional procedures and minimally invasive surgery, this electromagnetic tracking technology can greatly relieve patients' suffering and reduce medical risks to make medical care safer, and enhance the surgical technology level in hospital.