The diagnostic accuracy of single photon emission computed tomography (SPECT) is profoundly influenced by attenuation phenomenon. Soft tissue attenuation degrades cardiac SPECT image quality, thereby decreasing the possibility of the detection of the lesions. A variety of correction techniques based on different assumptions have been used to reduce the impact of attenuation. Several types of sy...

T he National Emphysema Treatment Trial (NETT) [1] helped clarify the patient selection criteria and expected risks and benefits of lung volume reduction surgery (LVRS) for patients with advanced emphysema. The NETT built on numerous earlier case series which showed that the greatest symptomatic and functional benefit accrued to patients with a predominantly upper lobe distribution of emphysema...

One of the many drawbacks of quarterly journals is that material is often not timely. Tragically, the events in the US have an eerie, timeless quality. As I write this editorial, the terrorist attacks are only a week old. No one needs a reminder of the grisly, almost unbelievable images. But as editor of a journal called Injury Prevention I feel compelled to ask how this might have been prevent...

A precise and commonly accepted definition of paraphrasing does not exist. This is one of the reasons that have prevented computational linguistics from a real success when dealing with this phenomenon in its systems and applications. With the aim of helping to overcome this difficulty, in this article, new insights on paraphrase characterization are provided. We first overview what has been sa...