Patrick Landwehr

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OBJECTIVE High soft-tissue contrast and multiplanar imaging capabilities of MRI may be advantageous in biopsy guidance compared to CT. We report our first results with MR-guided core biopsies using a closed 1.0 T MR imager. METHODS AND PATIENTS In ten patients, seven liver lesions and one lesion each in the muscle of the back, the gluteal muscle and in(More)
RATIONALE AND OBJECTIVES To evaluate the intraluminal signal characteristics of various stents and stent-grafts in contrast-enhanced three-dimensional MR angiography (3D MRA) in vitro. METHODS Fourteen stents made of different materials (steel, nitinol, tantalum, cobalt-based alloy, polyethylene) and six stent-grafts were implanted in plastic tubes(More)
The incidence of femoral artery pseudoaneurysms (p.a.) complicating diagnostic catheter procedures is only reported in studies regarding clinical symptoms. Since the diagnosis of aneurysms can (provided the vessel is visible) easily be done by ultrasound we made a prospective investigation of patients following coronary angiography. The unmistakable picture(More)
Usually, standard radiographs are used for postoperative quality follow-up after ACL reconstruction. However, with the use of hamstring grafts and bioabsorbable implants, accurate assessment of the tunnel and implant position is impossible. The graft and its relation to anatomical landmarks cannot be evaluated directly. MRI is an alternative to radiography,(More)
Since two decades transarterial chemoembolization (TACE) of liver metastases has been investigated in numerous studies. However, no standardized therapeutic procedure exists so far. The present study retrospectively investigated survival, response and side effects after TACE of liver metastases in 21 patients with colorectal cancer and results are compared(More)
The purpose of this study is to compare triphasic helical CT and fast MRI with respect to detection, characterization and staging of suspected renal masses. To achieve this triphasic helical CT (plain, corticonephrographic and tubulonephrographic phase) and MRI with fast T(1) weighted and T(2) weighted sequences were performed in 29 patients with a(More)
PURPOSE Comparative evaluation of specimens obtained with different MR-compatible biopsy systems and a conventional ferromagnetic system. METHODS Biopsies of a pig liver were performed post-mortem with three different MR-compatible (Somatex; E-Z-EM; Daum) and one conventional biopsy system (Somatex), five with each device. The specimens were measured and(More)
In a prospective study, the arterial puncture site was studied sonographically in 1120 patients who had undergone cardiac catheterisation or angioplasty (renal or extremities). Contrary to the figures in the literature, there was an incidence of 3.84% of false aneurysms (catheters 5.26%, angioplasty 2.36%). Conventional sonography and colour-coded duplex(More)