Eduard E. de Lange

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Inhaled hyperpolarized helium-3 (/sup 3/He) gas is a new magnetic resonance (MR) contrast agent that is being used to study lung functionality. To evaluate the total lung ventilation from the hyperpolarized /sup 3/He MR images, it is necessary to segment the lung cavities. This is difficult to accomplish using only the hyperpolarized /sup 3/He MR images, so(More)
Patients with borderline resectable pancreatic ductal adenocarcinoma (PDA) represent a high-risk group of patients due to tumor or patient-related characteristics. The optimal management of these patients has not been fully defined. All patients undergoing evaluation for PDA between 2005 and 2008 were identified. Clinical, radiographic, and pathological(More)
Cat scratch disease is an infectious lymphadenitis frequently occurring in children and adolescents. We present the magnetic resonance imaging findings of two patients with this disease. In both cases, lymphadenopathy was characterized by extensive stranding of the surrounding soft tissues, consistent with the inflammatory nature of this condition. Magnetic(More)
The signal-to-noise ratio (SNR) of hyperpolarized noble gas MR images is sensitive to the flip angle used. Variations in flip angle due to B 1-inhomogeneity of the RF coil cause intensity variation artifacts in lung ventilation images which may mask or mimic disease. We show these artifacts can be minimized by using the optimal flip angle and corrected if(More)
Purpose: To determine the accuracy and optimal threshold values of duplex ultrasonography (US) in assessing restenosis of renal artery stents. Methods: Twenty-four consecutive patients with 33 renal arteries that had previously been treated with placement of a Palmaz stent underwent duplex US prior to intraarterial digital subtraction angiography (DSA),(More)
Recent innovations in hyperpolarized helium-3 magnetic resonance imaging (MRI) include the employment of MR tagging techniques for assessment of pulmonary deformation. Historically, such tagging methods have been successfully applied to cardiac research inspiring the development of computational techniques for the quantitative analysis of myocardial(More)
Background: Several variants of a phase-based method for B1 mapping or transmitter calibration have been proposed for hyperpolarized-gas (HPG) lung imaging [13]. For transmitter calibration, the signal is typically integrated over a thick slice through the lung, and thus robust performance in the presence of a range of resonance offsets is more critical(More)
Synovial chondromatosis is a rare disorder of unknown cause characterized by multiple calcific bodies in the vicinity of the affected joint. It is most commonly seen in the knee, hip, elbow, and shoulder. We describe three cases of synovial chondromatosis in two extremely uncommon sites, the inferior radioulnar joint and the ischial bursa, and review the(More)
A 20-year-old male presented for the first t ime app rox imate ly 6 m o n t h s af ter injuring the left four th toe. R a d i o g r a p h s were not ob ta ined at the t ime of injury. A few m o n t h s later the pa t ien t not iced m a r k e d swelling o f the toe which never comple te ly resolved. Several weeks before presenta t ion , he b u m p e d the(More)
High-quality preoperative cross-sectional imaging is vital to accurately stage patients with pancreatic ductal adenocarcinoma (PDAC). We hypothesized that imaging performed at a high-volume pancreatic cancer center with pancreatic imaging protocols more accurately stages patients compared with pre-referral imaging. We retrospectively reviewed data from all(More)