We present a case of a pseudoaneurysm within the lumbar musculature. This occurred following a computed tomography (CT)-guided vertebral biopsy in a 79-year-old male patient and was successfully treated with percutaneous ultrasound-guided thrombin injection. The patient initially presented with severe back pain. The plain radiographs and Magnetic resonance imaging (MRI) ...

BACKGROUND: Magnetic resonance-guided PLDD has been performed for patients with single-level contained focal disk herniation. We investigated the clinical results of our PLDD practice in reference to the site of the needle tip. METHODS: Thirty-two patients (24 male patients and 8 female patients; mean age, 35 years) who presented with ...

A new 'texturing method' has been developed for nerve block needles in an attempt to improve the ultrasonic image of the needles. Using a synthetic phantom, these textured needles were compared to currently available needles. The textured needle had improved visibility under ultrasound. This type of needle may assist the ...

Three-dimensional numerical simulations of multi-cryo-needle surgery were performed with cryo-needle temperature variations taken from matched experimental data. The transient temperatures and frozen volumes generated by simultaneously operating up to three 1.47 mm OD cryo-needles embedded in a phase-changing gel simulating the properties of biological tissues, were studied. In all cases ...

The authors describe a new minimally invasive technique for posterior supplementation using percutaneous translaminar facet screw (TFS) fixation with computed tomography (CT) guidance. Oblique axial images were used to determine facet screw fixation sites. After the induction of local anesthesia and conscious sedation, a guide pin was inserted and guided ...

BACKGROUND: Hookwire localization is the current standard technique for radiological marking of nonpalpable breast lesions. Stereotactic directional vacuum-assisted breast biopsy (SVAB) is of sufficient sensitivity and specificity to replace surgical biopsy. Wire localization for metallic marker clips placed after SVAB is needed. PURPOSE: To describe a method for performing computed ...

PURPOSE: Respiratory motion can be a complicating factor during image-guided interventions. The ability to reproduce breath-holds may facilitate safer needle-based procedures. The purpose of this study was to evaluate if respiratory biofeedback decreased variability among breath-holds and if the signals from the respiratory bellows belt can be used to measure ...

PURPOSE: To evaluate the use of three-dimensional (3D) gradient-echo (GRE) magnetic resonance imaging (MRI) for percutaneous MR-guided catheter placement for laser therapy of liver metastases. MATERIALS AND METHODS: Thirty-four patients were included. A total of 122 MR-guided percutaneous punctures of 67 liver metastases were performed on a 1.5T scanner (Symphony ...

Interventional radiology plays an important role in the diagnosis and treatment of many oncologic disorders. Magnetic resonance imaging (MRI) has excellent soft-tissue contrast capabilities and allows visualization of anatomical details of many organs that is not possible with other imaging modalities. MRI also is multiplanar, has the ability to display ...

STUDY OBJECTIVES: We evaluated the feasibility and efficacy of transbronchial biopsy (TBB) and bronchial brushing by endobronchial ultrasonography (EBUS) with a guide sheath (GS) as a guide for diagnosing peripheral pulmonary lesions (PPLs) without radiographic fluoroscopy. PATIENTS: One hundred twenty-one patients with 123 PPLs (mean diameter, 31.0 mm) whose bronchoscopic ...

We had reported the utility of virtual bronchoscopic navigation system under CT-guidance for the diagnosis of small peripheral pulmonary lesions (PPLs). This study investigated the efficacy of virtual bronchoscopic navigation system for the diagnosis of small PPLs under X-ray fluoroscopy. We performed bronchoscopy with this system for 94 consecutive patients ...

AIM: The incorporation of autofluorescence (AF) to white light bronchoscopy has led to improved sensitivity for the detection of pre-neoplastic lesions in the airways. However, AF has difficulty distinguishing benign epithelial changes such as bronchitis, previous biopsy, and airway fibrosis from pre-invasive lesions, which necessitates extensive biopsy. This frequently results ...

PURPOSE: To conduct computed tomography (CT)-guided puncture exactly and safely, we newly developed a laser guiding puncture system that can be used in a commercially available CT scanner. MATERIALS AND METHODS: The laser-guided CT puncture system is built on the CT table with an aluminum frame. Preliminary simulation tests were ...

BACKGROUND AND AIM: Endoscopy is an important clinical tool for the diagnosis and treatment of gastrointestinal disorders. However, biopsy tissue is still required in many cases to obtain a definitive histopathological diagnosis. The aim of this study was to evaluate confocal endomicroscopy (CEM) as a tool for conducting virtual biopsies ...

BACKGROUND AND OBJECTIVES: High-resolution ultrasound imaging (HRUI) allows real-time visualization of peripheral nerves, needle insertion, and the spread of local-anesthetic (LA) solution. We evaluated the feasibility of performing a high interscalene brachial-plexus block for carotid endarterectomy by means of HRUI, thereby limiting the amount of LA to the dose required ...

BACKGROUND: Reliable measurement of subfascial pressures represents an essential part of compartment syndrome management. To date, there is neither consensus on the number or location of foot compartments, nor a standardized protocol for needle placement. The purpose of this study was to devise a new system using 3-Tesla MRI that ...

OBJECTIVE: The purpose of this study was to evaluate the accuracy and complications of imaging-guided core biopsy in the diagnosis of pelvic masses. CONCLUSION: Imaging-guided core biopsy of pelvic masses is accurate and safe. The accuracy and sensitivity of biopsy under sonographic guidance are higher than those of CT-guided biopsy, ...

BACKGROUND: Ductoscopy is gaining increased importance in the diagnosis of nipple discharge of unclear origin and intraductal proliferation. For this reason we compared its diagnostic value and feasibility to standard diagnostic methods. MATERIAL AND METHODS: Ductoscopy was compared to mammography, galactography, sonography, magnetic resonance imaging (MRI), nipple smear, fine needle ...

OBJECTIVE: To review the operative time differences between computer-assisted spinal navigation versus serial radiography. SUMMARY OF BACKGROUND DATA: There have been multiple studies describing the use of computer-assisted image guided surgery (IGS) in the application of spinal instrumentation. Techniques have evolved to allow attainment of multilevel visualization intraoperatively both successfully ...

BACKGROUND: Blind injection of the subacromial-sub-deltoid bursa (SSB) for diagnostic purposes (Neer test) or therapeutic purposes (corticosteroid therapy) is frequently used. Poor response to previous blind injection or side effects may be due to a misplaced injection. It is assumed that ultrasound (US)-guided injections are more accurate than blind injections. ...

BACKGROUND: Intralumenal full-thickness gastric resection (FTGR) could be useful as a biopsy technique or in the management of gastric neoplasms. SurgASSIST is a cutting and stapling device delivered on a steerable shaft to which interchangeable stapling units are affixed. OBJECTIVE: This feasibility study assessed the applicability of the SurgASSIST to ...

Endoscopic surgery has some clear benefits, but it also has some disadvantages in reducing surgeons' normal dexterity and limiting their ability to deal with difficult situations. Computer-aided surgery has been proposed to overcome some of the drawbacks of traditional minimally invasive surgery. The proposed systems make possible a secure, precise ...

Combining mammography and ultrasound improves the sensitivity of imaging diagnosis. In the context of clinical masses, where percutaneous needle biopsy is routinely incorporated into the diagnostic pathway, little is known about the incremental gain in sensitivity where using single relative to combined imaging. We examined the sensitivity of imaging and ...

OBJECTIVE: To evaluate the effect of acupuncture for obesity. METHOD: Points were selected according to the pattern identified, and punctured with the No.30 magnetic needles. RESULT: A total effective rate of 97% was achieved after 15 sessions were completed. CONCLUSION: The therapy can reduce the body weight by accelerating the ...

PURPOSE: To evaluate the imaging features of transrectal ultrasound (TRUS) performed immediately after prostate biopsy, and to determine whether TRUS-guided compression can stop active bleeding. MATERIAL AND METHODS: Systematic 12-core biopsy was performed in 57 consecutive patients, 24 of whom underwent additional target biopsy. The imaging features of grayscale and ...

The indications and uses of endoscopic ultrasound (EUS) are expanding. The role of EUS-guided fine needle aspiration (EUS-FNA) is considered an essential aspect of EUS practice. A significant change in the indications and technology used for EUS has occurred. This study was designed to compare the use of radial, linear, ...

INTRODUCTION: Recent advances in multidetector CT imaging (MDCT) provide real-time "fluoroscopic-like" capabilities with excellent spatial resolution. MDCT fluoroscopy expands our ability to perform image-guided interventions in anatomically complex locations. Although MDCT fluoroscopy is currently used at our institution for a variety of procedures ranging from spinal nerve blocks to RFA ...

OBJECTIVE: The purpose of this study was to describe the technique of and experience in using CT guidance for percutaneous iliosacral screw placement in patients with unstable pelvic fractures. CONCLUSION: CT-guided iliosacral screw placement is a safe and accurate procedure that can be performed by radiologists in a radiology suite.

AIM: To evaluate the use of a phantom system to help teach the basic techniques of accurate CT-guided needle placement, thereby avoiding the risks associated with teaching on patients. MATERIALS AND METHODS: Gelatine phantoms with five, 1.9 cm embedded spherical wooden targets were constructed. Four trainee operators performed 15 simulated ...

Computed tomography (CT)-guided transbronchial biopsy (TBB) using an ultrathin bronchoscope with simulation by virtual bronchoscopy (VB) is effective for diagnosing small peripheral pulmonary lesions. However, we occasionally lose the proper bronchi to the lesion when a bronchoscope is inserted into peripheral bronchi with severe rotation. To overcome this problem, the ...

A 60-year-old man with a 4-year history of intractable neck pain and radicular pain in the C5 nerve root distribution presented to our department for a CT-guided transforaminal left C5 nerve root block. He had had a similar procedure on the right 2 months previously, and had significant improvement of ...

Performing an MR-guided endovascular intervention requires (1) real-time tracking and guidance of catheters/guide wires to the target, (2) high-resolution images of the target and its surroundings in order to define the extent of the target, (3) performing a therapeutic procedure (delivery of stent or injection of gene or cells) and ...

We present software engineering methods to provide free open-source software for MR-guided therapy. We report that graphical representation of the surgical tools, interconnectively with the tracking device, patient-to-image registration, and MRI-based thermal mapping are crucial components of MR-guided therapy in sharing such software. Software process includes a network-based distribution mechanism ...

BACKGROUND: Long-standing debate continues about the management and biopsy of pineal tumors because of their complex microsurgical anatomy and deep location. Inspired by the concept of biopsy under direct visualization in the absence of hydrocephalus, we explored the effectiveness of neuroendoscope outside of its traditional territory using a new minimally ...

Magnetic Resonance Imaging (MRI) offers great potential for planning, guiding, monitoring and controlling interventions. MR arthrography (MRAr) is the imaging gold standard for assessing small ligament and fibrocartilage injury in joints. In contemporary practice, MRAr consists of two consecutive sessions: (1) an interventional session where a needle is driven to ...

Since the beginning of 2007 the first six robotically assisted CT-based clinical punctures were performed with a new CE-certified assistance device with CT and MRI compatibility. The cases treated include bone and soft-tissue interventions, closed reduction and percutaneous fixation of pelvic fractures, radiofrequency ablation (RFA) and drainage within a Multifunctional ...

Diagnostic and therapeutic CT- guided percutaneous interventions are clinical routine in interventional radiology. Image-guided navigation systems visualize the internal anatomy during interventions in real time not necessitating continuous image acquisition. Although multiple 3D image-guidance devices have been developed and used by several surgical disciplines in the last few years, they ...

We present here the state of our work on medical simulators. We have developed several patient-based training simulators for ultrasound examination and ultrasound guided needle insertion. These simulators are built upon a method already described in MMVR in 2005 that allows to automatically create new cases from a 3D medical ...

BACKGROUND: The concept of acupuncture point localisation in Traditional Chinese Medicine (TCM) is based on millenary practical experience. Modern imaging methods such as PET, MRI and SPECT have been used primary for the investigation of the mechanisms of action of acupuncture. In this pilot single-case study we have evaluated the ...

OBJECTIVE: When performing epidural steroid injections for the management of chronic back pain, imaging guidance and a limited epidurogram improve accuracy of needle placement and ensure appropriate delivery of the injectate into the epidural space. We describe our experience using a gadolinium chelate as an alternative contrast agent for limited ...

OBJECTIVE: Imaging-guided biopsies of solid pancreatic masses are performed with either CT or endoscopic sonography at our institution. We compared test characteristics of fine-needle aspiration biopsies guided using CT with those guided using endoscopic sonography and secondarily evaluated for an effect of mass size. MATERIALS AND METHODS: Of 70 solid ...

This study was conducted to evaluate the importance of intraoperative smear examinations for the final diagnosis of intracerebral stereotaxic procedures. 125 consecutive patients with suspect intracerebral lesions underwent stereotaxic frame-based biopsies after acquisition of computer tomographic and magnetic resonance images. After secondary image processing, including multiplanar visualization of the target ...

OBJECTIVES: Frustrating outcomes are driving investigation of alternative resuscitation protocols. Previous analysis of the ventricular fibrillation (VF) waveform has focused on guiding whether to shock immediately or to delay for delivery of cardiopulmonary resuscitation in the case of presenting VF. The same issues emerge in the case of refibrillation. MEASUREMENTS ...

An interventional navigation system designed for percutaneous abdominal therapies was proposed, and a pilot study was carried out to assess the proposed system. Integration of US to MRI-based segmentation and 3D display of tumours can help physicians deal with instabilities such as respiratory motion and soft tissue shift that are ...

The purpose of this work was to implement and assess the performance of interventions inside a cylindrical magnetic resonance imaging (MRI) scanner with an MR-compatible manipulator system and manipulator-driven real-time MR guidance. The interventional system is based on a seven degree-of-freedom MR-compatible manipulator, which offers man-in-the-loop control either with a ...

OBJECTIVE: The objective of our study was to determine the incidence of tumor seeding after biopsy of hepatocellular carcinoma (HCC) using a coaxial cutting needle technique. Seeding along the needle track is a dreaded complication of percutaneous biopsy in patients with HCC, particularly in potential liver transplant recipients. Reported seeding ...

Up to now, the studies in the world have demonstrated that CT-guided percutaneous neurolytic celiac plexus block (PNCPB) is an invaluable therapeutic modality in the treatment of refractory abdominal pain caused by cancer. Its efficacy of pain relief varied in reported studies. The main technical considerations which would affect the ...

This report describes a special technique for safe establishment of a popliteal portal with the METRx system (Medtronic Sofamor Danek, Memphis, TN) under ultrasound guidance with the patient in the awake state. Herbert screws located at the posterior tibial plateau were removed via this portal in a minimally invasive way. ...

PURPOSE: Emerging interventional radiology assistance systems that incorporate electromagnetic navigation (EMN) can help the operator guide a needle or other instrument toward a target along preplanned oblique trajectories while avoiding critical structures. A proof-of-concept study was conducted to assess the use of EMN, and EMN was compared with the standard ...

A 50-year-old man underwent magnetic resonance imaging and was found to have an incidental 3.2-cm mass in a renal allograft. Because of the multiple comorbidities associated with renal allograft patients, a minimally invasive option such as percutaneous ablation should be considered. The patient underwent percutaneous ultrasound-guided cryoablation. The final histopathologic ...