n engl j med 373;16 nejm.org october 15, 2015 1579 iatrogenic radiation (repeated small-bowel imaging) imposes an environmental mutagenic pressure.3 In the past decade, there has been a major change in the management of Crohn’s disease through diagnosis by means of magnetic resonance enterography and treatment with powerful anti–tumor necrosis factor agents.4,5 Smallbowel cancer in Crohn’s dise...

A 47 years old lady presented with repeated intermittent, colicky, left upper, and periumblical abdominal pain associated with nausea and vomiting since two years prior to admission. Each episode of the pain spontaneously subsided after bilious vomiting. The patient had no history of surgery, abdominal trauma or intra-abdominal infection, weight loss or previous history for small bowel obstruct...

introduction: pulmonary embolism (pe) is a common lethal disease that its clinical symptoms may be seen in many other diseases. computed tomography pulmonary angiography (ctpa) is a valuable diagnostic modality for detection of pe. in addition, it can accurately detect the other diseases with clinical symptoms similar to pe. the aim of this study is to evaluate the frequency of pe and nonemboli...

in present pet/ct scanners, pet attenuation correction is performed by relying on the information given by ct scan. in the ct-based attenuation correction methods, dual-energy technique (dect) is the most accurate approach, which has been limited due to the increasing patient dose. in this feasibility study, we have introduced a new method that can implement dual-energy technique with only a si...