Medical intervention is to make use of puncture and catheterization technique for the diagnosis and treatment, relying on the guidance of medical imaging equipment. It is also a new medical branch which is independent of internal medicine and surgery. It is officially named the third largest medical technology. Interventional therapy contains blood vessel intervention and non-vessel intervention. The operation of the catheter and thread in the vessel is the key part of vessel intervention. By comparison it is found that the operation of catheter and thread in the blood vessel is similar to that of the string in the wellbore. Tubular mechanics in oil-gas wells is a mature theoretical mechanics system in the field of Petroleum Engineering. In this paper, the tension-torque model of the tubular mechanics in oil-gas wells is introduced, and the operation of catheter in a simulative vessel is mechanically analyzed with the software of mechanical analysis of drill string in directional wells.
Biomechanical Phenomena ; Blood Vessels ; pathology ; physiology ; Catheterization, Peripheral ; methods ; Humans ; Magnetic Resonance Imaging, Interventional ; Radiography, Interventional

This study aims to compare the prostate cancer detection rate between magnetic resonance imaging (MRI)-transrectal ultrasound (TRUS) cognitive fusion targeted biopsy and systematic biopsy. A total of 614 patients who underwent transrectal prostate biopsy during 2016-2018 with multiparametric magnetic resonance imaging (mpMRI) were included. All patients with a PI-RADS V2 score ≥ 3 accepted both targeted biopsy and systematic biopsy, and those with a PI-RADS V2 score ≤ 2 only accepted systematic biopsy. Overall prostate cancer detection rate between the two biopsies was compared. MRI-TRUS cognitive fusion targeted biopsy identified 342 cases (75.7%) of prostate cancer while systematic biopsy identified 358 cases (79.2%). There was no significant difference in the detection rate between the two groups ( = 1.621, = 0.203). Targeted biopsy had significant fewer biopsy cores compared with systematic biopsy, reducing (9.3 ± 0.11) cores ( < 0.001) in average. Targeted biopsy had about 10.8% ( < 0.001) more tumor tissues in positive cores compared with systematic biopsy. The results show that both MRI-TRUS cognitive fusion targeted biopsy and systematic biopsy have good detection rate on prostate cancer. Cognitive targeted biopsy may reduce biopsy cores and provide more tumor tissues in positive cores.
Biopsy ; methods ; Humans ; Image-Guided Biopsy ; Magnetic Resonance Imaging, Interventional ; Male ; Prospective Studies ; Prostatic Neoplasms ; diagnostic imaging ; Ultrasonography, Interventional

No abstract available.
Female ; Humans ; Leiomyoma/*therapy ; Magnetic Resonance Imaging, Interventional/*methods ; Uterine Artery Embolization/*methods ; Uterine Neoplasms/*therapy

Image-guided high-intensity focused ultrasound (HIFU) has been used for more than ten years, primarily in the treatment of liver and prostate cancers. HIFU has the advantages of precise cancer ablation and excellent protection of healthy tissue. Breast cancer is a common cancer in women. HIFU therapy, in combination with other therapies, has the potential to improve both oncologic and cosmetic outcomes for breast cancer patients by providing a curative therapy that conserves mammary shape. Currently, HIFU therapy is not commonly used in breast cancer treatment, and efforts to promote the application of HIFU is expected. In this article, we compare different image-guided models for HIFU and reviewed the status, drawbacks, and potential of HIFU therapy for breast cancer.
Breast Neoplasms ; diagnostic imaging ; pathology ; surgery ; Female ; High-Intensity Focused Ultrasound Ablation ; Humans ; Magnetic Resonance Imaging ; methods ; Ultrasonography, Interventional ; methods

This report discusses a pregnancy case following a series of two consecutive magnetic resonance imaging-guided focused ultrasound surgery (MRgFUS) procedures for the treatment of two different myomas in an individual patient. Both procedures were completed without adverse events, and the patient conceived naturally four months after treatment. At 39 weeks, she gave birth to a healthy baby girl, via a vaginal delivery. There were no complications in the pregnancy or during labor.
Adult ; Female ; Humans ; Magnetic Resonance Imaging, Interventional/*methods ; Myoma/*surgery ; Pregnancy ; Pregnancy Outcome ; Surgery, Computer-Assisted/*methods ; Uterine Neoplasms/*surgery

PURPOSE: The aim of this study was to investigate whether intraoperative ultrasonography (IOUS) helped the surgeon navigate towards the tumor as seen in preoperative magnetic resonance imaging and whether IOUS was able to distinguish between tumor margins and the surrounding tissue. METHODS: Twenty-five patients suffering from high-grade gliomas who were previously treated by surgery and radiotherapy were included. Intraoperatively, two histopathologic samples were obtained a sample of unequivocal tumor tissue (according to anatomical landmarks and the surgeon’s visual and tactile impressions) and a small tissue sample obtained using a navigated needle when the surgeon decided to stop the resection. This specimen was considered to be a boundary specimen, where no tumor tissue was apparent. The decision to take the second sample was not influenced by IOUS. The effect of IOUS was analyzed semi-quantitatively. RESULTS: All 25 samples of unequivocal tumor tissue were histopathologically classified as tumor tissue and were hyperechoic on IOUS. Of the boundary specimens, eight were hypoechoic. Only one harbored tumor tissue (P=0.150). Seventeen boundaries were moderately hyperechoic, and these samples contained all possible histological results (i.e., tumor, infiltration, or no tumor). CONCLUSION: During surgery performed on relapsed, irradiated, high-grade gliomas, IOUS provided a reliable method of navigating towards the core of the tumor. At borders, it did not reliably distinguish between remnants or tumor-free tissue, but hypoechoic areas seldom contained tumor tissue.
Brain* ; Glioblastoma ; Glioma* ; Humans ; Magnetic Resonance Imaging ; Methods ; Needles ; Neoplasm, Residual ; Neurosurgical Procedures ; Radiotherapy ; Ultrasonography* ; Ultrasonography, Interventional

In the interactive image-guided thermotherapy, we need the real time image and location of the target tumor. But the current mono-modal imaging technique can not do it. We present a method to register a preoperative 3D MRI volume to a set of intra-operative ultrasound images for the target localization of the liver tumor in the thermotherapy. The registration method is a genetic algorithm based on the features such as liver surface vessels and liver surface.
Humans ; Hyperthermia, Induced ; Image Processing, Computer-Assisted ; Imaging, Three-Dimensional ; Liver Neoplasms ; diagnostic imaging ; therapy ; Magnetic Resonance Imaging ; Ultrasonic Therapy ; methods ; Ultrasonography, Interventional

Ultrasonography (US) is extensively used in the diagnosis of prostate cancer; but with its disadvantages of poor sensitivity and specificity, frequently causes underdiagnosis, and over 50% of the results of transrectal ultrasound (TRUS)-guided biopsy fail to accord with those of surgical pathology. In addition to contrast-enhanced ultrasound and real-time elastography, various new ultrasonic techniques have been developed nowadays, such as prostate histoscanning, brachytherapy template-guided 3-dimensional mapping biopsy (3DMB), and MRI/US fusion. Prostate histoscanning is an ultrasound-based technology that uses computer-aided analysis to identify and characterize the foci of prostate cancer. 3DMB, involving the whole gland, has an even higher accuracy. MRI/US fusion integrates the advantages of pre-interventional MRI with those of peri-interventional ultrasonography, and offers high-resolution images and convenient puncturing. Constant development of ultrasonography will continue to add to its clinical application value.
Contrast Media ; Elasticity Imaging Techniques ; Humans ; Image-Guided Biopsy ; methods ; Magnetic Resonance Imaging ; Male ; Prostatic Neoplasms ; diagnosis ; diagnostic imaging ; Sensitivity and Specificity ; Ultrasonography, Interventional

ObjectiveTo improve the accuracy of prostate cancer (PCa) detection by focusing biopsy on the suspected lesion manifested by MRI with the total number of biopsy cores relatively unchanged.

METHODSA prospective randomized analysis was performed on 262 cases of suspected PCa detected by multi-parametric MRI (mp-MRI), each with a single suspected lesion with 10 μg/L≤ PSA <20 μg/L. All the patients underwent targeted transrectal prostate biopsy guided by fusion imaging of MRI with transrectal ultrasonography (TRUS), using the 6X+6 strategy (6 cores in the suspected region and another 6 in the systematic prostate) for 134 cases and the traditional 12+2X method (12 cores in the systematic prostate and 2 in the suspected region) for the other 128. Comparisons were made between the two methods in the PCa detection rate in the cases of suspected lesion, total PCa detection rate, incidence of post-biopsy complications, and Gleason scores. Analyses were performed on the prostate imaging reporting and data system (PI-RADS) score, location, transverse section, and diameter of the suspected lesion.

RESULTSBoth the total PCa detection rate and that in the cases of suspected lesion were significantly higher in the 6X+6 (44.8% and 37.3%) than in the 12+2X group (37.5% and 27.3%) (P<0.05). MRI showed that the suspected lesions were mostly (45%) located in the middle part of the prostate, the mean area of the transverse section was (0.48±0.11) cm2, and the mean diameter of the tumor was (8.51±2.21) mm. The results of biopsy showed that low-grade tumors (Gleason 3+3=6) accounted for 68% in the 6X+6 group and 71% in the 12+2X group. No statistically significant differences were found between the two groups in the incidence rate of post-biopsy complications.

CONCLUSIONSCompared with the traditional 12+2X method, for the suspected lesion manifested by mp-MRI, focusing biopsy on the suspected region with the 6X+6 strategy can achieve a higher PCa detection rate without increasing the incidence of complications.

Humans ; Image-Guided Biopsy ; methods ; Magnetic Resonance Imaging ; methods ; Magnetic Resonance Imaging, Interventional ; Male ; Neoplasm Grading ; Prospective Studies ; Prostate ; diagnostic imaging ; pathology ; Prostate-Specific Antigen ; blood ; Prostatic Neoplasms ; blood ; diagnostic imaging ; pathology

OBJECTIVE: To evaluate the efficacy of computer tomography (CT)-guided core needle biopsy (CNB) in the diagnosis of deep suprahyoid lesions in patients with treated head and neck cancers. MATERIALS AND METHODS: Between December, 2003 and May, 2011, 28 CT-guided CNBs were performed in 28 patients with deep suprahyoid head and neck lesions. All patients had undergone treatment for head and neck cancers. Subzygomatic, paramaxillary, and retromandibular approaches were used. The surgical results, response to treatment, and clinical follow-up were used as the diagnostic reference standards. RESULTS: All biopsies yielded adequate specimens for definitive histological diagnoses. A specimen from a right parapharyngeal lesion showed atypia, which was deemed a false negative diagnosis. Diagnostic accuracy was 27/28 (96.4%). Two minor complications were encountered: a local hematoma and transient facial palsy. Between the 18 or 20 gauge biopsy needles, there was no statistical difference in the diagnostic results. CONCLUSION: CT-guided core needle biopsy, with infrequent and minor complications, is an accurate and efficient method for the histological diagnosis of deep suprahyoid lesions in post-treated head and neck cancer patients. This procedure can preclude an unnecessary surgical intervention, especially in patients with head and neck cancers.
Adult ; Aged ; Biopsy, Needle/*methods ; Female ; Head and Neck Neoplasms/*pathology/radiography ; Humans ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Radiography, Interventional/*methods ; Retrospective Studies ; Tomography, X-Ray Computed/*methods