[Radiological placement of peripheral central venous access ports at the forearm. Technical results and long term outcome in 391 patients].

Purpose: To retrospectively analyze the technical result and long term outcome of central venous arm ports placed by radiologists.

Materials And Method: Over a 5-year period, 399 arm ports were implanted by radiologists in 391 patients. The system consists of a low profile titanium chamber and a silicone catheter.

Spinal metastases from renal cell carcinoma: effect of preoperative particle embolization on intraoperative blood loss.

Background And Purpose: Surgical repair of spinal metastases from renal origin is often complicated by excessive bleeding. The purpose of this study was to assess the effect of preoperative particulate embolization on intraoperative blood loss.

Methods: Twenty spinal metastases from renal origin (17 patients) treated by preoperative embolization with polyvinyl alcohol particles were analyzed retrospectively.

[Possibilities and limits of interventional therapy in necrotizing pancreatitis].

We present a new technique for minimal invasive radiological assisted necrosectomy (MIRAN) for infected necrosis in acute pancreatitis. We describe how to place volumic catheters for fragmentation and extraction of necrotic material. In addition a new technique is described for minimal invasive occlusion of selected pancreas tail to avoid fistulas.

Digital radiography of the skeleton using a large-area detector based on amorphous silicon technology: image quality and potential for dose reduction in comparison with screen-film radiography.

Aim: The purpose of this study was to evaluate a large-area, flat-panel X-ray detector (FD), based on caesium-iodide (CsI) and amorphous silicon (a-Si) with respect to skeletal radiography. Conventional images were compared with digital radiographs using identical and reduced radiation doses.

Materials And Methods: Thirty consecutive patients were studied prospectively using conventional screen-film radiography (SFR; detector dose 2.

Chest radiography with a large-area detector based on cesium-iodide/amorphous-silicon technology: image quality and dose requirement in comparison with an asymmetric screen-film system.

The purpose of this study was to evaluate a large-area, flat-panel X-ray detector, which uses cesium-iodide (CsI) and amorphous silicon (a-Si). Conventional images were compared with digital images acquired with equal dose (2.5 microGy) and with 50% dose reduction.

[Transfemoral pelvic vein angiography with CO2: experiences with pressure- and volume-controlled injections].

Purpose: To evaluate the efficacy of CO2 in aortobifemoral DSA with a pressure- and volume-controlled injector.

Materials And Methods: In an intraindividual prospective study, 42 patients with arterial occlusive disease underwent stepwise aortobifemoral DSA with CO2 and with iopromid 300.

Results: With Co2, diagnostic images were obtained in 74% of the iliac, 98% of the femoral, 89% of the popliteal arteries, but in only 36% of the arteries of the lower leg.

[Intraabdominal abscesses. Intervention versus surgical treatment].

As the diagnosis of intraabdominal abscesses has been continuously facilitated by the use of ultrasound and CT-scan, interventional management by percutaneous drainage provides an excellent alternative treatment concept to conventional open surgery. With the use of special flow-suction-catheters which are placed into the abdomen under sonographic or computertomographic guidance, the success rates in the literature are ranging between 33% and 100%, depending on the initial situation, etiology and morphology of the findings. Studies performed with comparable patient collectives showed that interventional treatment methods had equal results to conventional surgery.

Temporary Strecker stent for management of acute dissection in popliteal and crural arteries.

Stent placement is a widely used bail-out treatment for dissection of peripheral arteries. Below the level of the superficial femoral artery permanent stenting is complicated by a high incidence of subacute thrombosis and restenosis. We present two cases of arterial occlusion due to acute iatrogenic dissection of the popliteal and distal fibular arteries.

[Digital flat image detector technique based on cesium iodide and amorphous silicon: experimental studies and initial clinical results].

Purpose: Experimental and clinical evaluation of a digital flat-panel X-ray system based on cesium iodide (CsI) and amorphous silicon (a-Si).

Methods: Performance of a prototype detector was compared with conventional screen-film radiography (SFR) using several phantom studies. Foreign bodies, fractures, osteolyses, and pulmonary lesions were analyzed.

[Radiologic implantation of central venous portal systems in the forearm].

Purpose: To assess the safety and effectiveness of fluoroscopic guided brachial implanted central-venous miniport systems.

Patients And Methods: In 32 oncological patients a central-venous miniport system (Vital-Port, CPC-Cook) was implanted in the forearm. The group included 15 women and 17 men (range 33-78, mean 56 years).

Ischiogluteal bursitis mimicking soft-tissue metastasis from a renal cell carcinoma.

We report a case of ischiogluteal bursitis mimicking a soft-tissue metastasis from a renal cell carcinoma. A 66-year-old woman suffered from pain over the left buttock 6 months after she was operated on for renal cell carcinoma of the left kidney. CT of the abdomen and pelvis revealed a tumor-like lesion adjacent to the left os ischii, which was suspected to be a soft-tissue metastasis.

Clinical application of a flat-panel X-ray detector based on amorphous silicon technology: image quality and potential for radiation dose reduction in skeletal radiography.

Objective: The purpose of this study was to compare images obtained with a self-scanning, flat-panel X-ray detector based on amorphous silicon technology with conventional screen-film radiographs and to evaluate the possibility of radiation dose reduction in skeletal radiography.

Subjects And Methods: One hundred twenty patients were examined prospectively using a conventional screen-film system (speed, 400; detector dose, 2.5 microGy) and a prototype digital amorphous silicon detector (simulated speed, 400 and 800, n = 120; simulated speed, 1600, n = 40).

Dedicated head-neck coil in MR angiography of the supra-aortic arteries from the aortic arch to the circle of Willis.

Purpose: To evaluate the usefulness of a dedicated head-neck coil in preoperative imaging of the supra-aortic arteries.

Material And Methods: Forty consecutive patients with suspected carotid artery stenosis underwent MR angiography (MRA). Using a dedicated head-neck coil, we made a complete evaluation of the supra-aortic arteries and graded the internal carotid artery (ICA) stenoses.

Detection of simulated chest lesions with normal and reduced radiation dose: comparison of conventional screen-film radiography and a flat-panel x-ray detector based on amorphous silicon.

Rationale And Objectives: The authors compared a solid-state amorphous silicon (a-Si) detector and screen-film radiography (SFR) with regard to the detection of simulated pulmonary lesions. Evaluation of the impact of a dose reduction of 50% with this digital flat-panel detector was of special interest.

Methods: A self-scanning flat-panel detector, based on a-Si technology with 143 x 143 microm pixel size, 1 k x 1 k matrix and 12-bit digital output was used.

Amorphous silicon, flat-panel, x-ray detector versus screen-film radiography: effect of dose reduction on the detectability of cortical bone defects and fractures.

Rationale And Objectives: The purpose of this phantom study was to assess the diagnostic performance of a self-scanning, solid-state amorphous silicon (a-Si) detector in skeletal radiography using different exposure parameters.

Methods: A flat-panel detector (15 cm x 15 cm), based on a-Si technology with 143 microm x 143 microm pixel size, 1k x 1k matrix, and 12 bit digital output was used. State-of-the-art screen-film radiography (SFR; speed 400, detector dose 2.

[Computer tomography-guided gastrostomy, jejunostomy and gastrojejunostomy. A reliable non-surgical method also for contraindications and failure of percutaneous endoscopic gastrostomy].

Objective: To analyse retrospectively the results of CT (computed tomography)-guided gastrostomy or gastroenterostomy where an endoscopic procedure was not possible or had failed.

Patients And Methods: Between August 1993 and March 1997, CT-guided gastrostomy (n = 50) or gastroenterostomy (n = 8) was performed in 58 patients (mean age 56 +/- 6 years; 51 males, 7 females). An endoscopic or fluoroscopic method had been contraindicated in 52 and had failed in 6 patients.

Diagnosis of liver metastases from colorectal adenocarcinoma. Comparison of spiral-CTAP combined with intravenous contrast-enhanced spiral-CT and SPIO-enhanced MR combined with plain MR imaging.

Purpose: The purpose of this study was to determine whether MR with and without SPIO (AMI-25) could replace spiral-CTAP in the staging of colorectal adenocarcinoma.

Material And Methods: Thirty-five patients were studied prospectively by means of i.v.

Cerebral CT angiography in the diagnosis of acute subarachnoid hemorrhage.

Purpose: To evaluate the usefulness of CT angiography (CTA) in the detection of intracranial aneurysms in patients with acute subarachnoid hemorrhage (SAH).

Material And Methods: In 53 patients with nontraumatic SAH a helical contrast-enhanced CTA was performed. CTA data were reconstructed with maximum intensity projection (MIP).

Spontaneous rupture of liver in a patient with Ehlers Danlos disease type IV.

Ehlers-Danlos syndrome (EDS) type IV is an autosomal dominant connective tissue disease caused by mutations in the type III collagen gene resulting in extreme tissue fragility. Affected individuals are at risk of dramatic and often fatal complications, mostly spontaneous arterial, uterine, or colonic ruptures. Phenotypic expression of EDS type IV is variable and clinical signs are generally quite subtle, thus making a prompt diagnosis difficult.

Flat-panel x-ray detector using amorphous silicon technology. Reduced radiation dose for the detection of foreign bodies.

Rationale And Objectives: The authors evaluate a new flat-panel x-ray detector (FD) with respect to foreign body detection and reduction of radiation dose compared with screen-film radiography.

Methods: Flat-panel x-ray detector is based on amorphous silicon technology and uses a 1 k x 1 k photo-detector matrix with a pixel size of 143 x 143 microns and 12-bit digital output. A thallium-dotted cesium iodide scintillation layer converts x-rays into light.

Magnetic resonance of the disk of the temporomandibular joint. MR imaging protocol.

Disk displacement can be well detected using proton density-weighted and T2*-weighted two-dimensional gradient-echo sequences. In uncertain cases, especially if the bilaminar zone is not sufficiently represented, a contrast-enhanced T1-weighted spin-echo sequence should also be performed. Also in patients with disk degeneration and osteoarthritis of the temporomandibular joint, proton density-weighted and T2*-weighted two-dimensional gradient-echo sequences are of great diagnostic value.

[CT-guided percutaneous endoscopic gastrostomy: a successful method if transillumination is not possible].

Background And Objective: If transillumination is not possible, percutaneous endoscopic gastrostomy (PEG) is contraindicated. In these cases the stomach had so far to be punctured directly during radiological monitoring. A new method is described which combines endoscopy and computed tomography (CT) for performing a percutaneous endoscopic gastrostomy.