A 50-year old woman was admitted to emergency room due to an episode of recurrent renal colic. Double-J ureteral stent has been placed several weeks earlier due to mild hydronephrosis of the left kidney. She had a history of urinary tract infections and poorly defined abdominal pain. Abdominal computed tomography (CT) scan revealed normal left kidney and normal left urinary tract without calcul...

MR-guided focused ultrasound (FUS) is a noninvasive therapy for treating various pathologies. MR-based acoustic radiation force imaging (MR-ARFI) measures tissue displacement in the focal spot due to acoustic radiation force. MR-ARFI also provides feedback for adaptive focusing algorithms that could correct for phase aberrations caused by the skull during brain treatments. This work developed a...

PURPOSE This study quantifies in vivo ischemic stroke brain injuries in rats using ultrahigh-field single-scan MRI methods to assess variations in apparent diffusion coefficients (ADCs). METHODS Magnitude and diffusion-weighted spatiotemporally encoded imaging sequences were implemented on a 21.1 T imaging system, and compared with spin-echo and echo-planar imaging diffusion-weighted imaging ...

We describe in this paper two on-line algorithms for covering planar areas by a square-shaped tool attached to a mobile robot. Let D be the tool size. The algorithms, called Spanning Tree Covering (STC) algorithms, incrementally subdivide the planar area into a grid of D-size cells, while following a spanning tree of a grid graph whose nodes are 2D-size cells. The two STC algorithms cover gener...

UNLABELLED The purpose of this study was to investigate the incremental value and diagnostic impact of SPECT/CT in patients who had a solitary spinal lesion on a bone scan. METHODS A prospective study was performed on 80 patients (50 with known cancer) who underwent (99m)Tc-methylene diphosphonate whole-body planar bone scintigraphy and had a solitary spinal lesion. These lesions were then fu...

A post-processing technique has been developed to suppress the MRI artifact arising from object planar rigid motion. In 2-DFT MRI, rotational and translational motions of the target during MR scan respectively impose non-uniform sampling and a phase error on the collected MRI signal. The artifact correction method introduced considers the following three conditions: (i) For planar rigid motion ...

Considering the network structure is one of the new approaches in studying stochastic PERT networks (SPN). In this paper, planar networks are studied as a special class of networks. Two structural reducible mechanisms titled arc contraction and deletion are developed to convert any planar network to a series-parallel network structure. In series-parallel SPN, the completion time distribution f...

BACKGROUND Low back pain (LBP) is very common in the general population. Most patients with LBP will receive an X-ray examination on lumbar spine; however, the results are likely to show a negative finding or degenerative joint disease, which are not truly pathological factors. Among various imaging diagnostic tools for active bony lesions of lumbar spine, planar bone scintigraphy has a higher ...