Introduction:Foreign body aspiration is usually a serious condition that is most common among the pediatric population, and rare in adults. In adults, aspiration may be tolerated for a long time.Case Reports:Our first case is a 38-year-old man who presented with a 2-day history of swallowing a foreign body. He was completely asymptomatic. Chest X-ray revealed the presence of 5-cm foreign object...

Synopsis This chapter presents x-ray image quality optimization techniques using digital phantom images and computerized observer models. The X-ray imaging parameters are optimized so as to maximize tumor detectability while minimizing the patient dose. Digital phantoms are generated using the virtual photographic and radiographic imaging simulator (ViPRIS) package. ViPRIS uses a tomographic ph...

introduction:foreign body aspiration is usually a serious condition that is most common among the pediatric population, and rare in adults. in adults, aspiration may be tolerated for a long time.case reports:our first case is a 38-year-old man who presented with a 2-day history of swallowing a foreign body. he was completely asymptomatic. chest x-ray revealed the presence of 5-cm foreign object...

This study develops and demonstrates a realistic x-ray imaging simulator with computerized observers to maximize lesion detectability and minimize patient exposure. A software package, ViPRIS, incorporating two computational patient phantoms, has been developed for simulating x-ray radiographic images. A tomographic phantom, VIP-Man, constructed from Visible Human anatomical colour images is us...

Case: A 47-year-old Iranian man presented with a 3-month history of painful extremities lesions. The lesions began with an erythematous papule that progressively enlarged and ulcerated. His left calf was the first site of involvement. At the time we visited him, there were necrotic painful violaceous skin ulcers with a symmetrical distribution involving lower parts of distal limbs and his...

The case of a 33-year-old man with a hemangioma involving the frontal sinus is reported. The patient presented with a gradually inereasing hard lump over the forehead and frontal headaehes. Charaeteristie changes on plain X-ray and computed