To compare the radiation dose and image noise of nonenhanced CT scans performed at 80, 100, and 120 kVp with tube current modulation (TCM) we used anthropomorphic phantoms of newborn, 1-year-old, and 5-year-old children. The noise index was set at 12. The image noise in the center of the phantoms at the level of the chest and abdomen was measured within a circumscribed region of interest. We me...

CMAJ © 2010 Canadian Medical Association or its licensors 1 A54-year-old man with a history of cirrhosis following liver transplantation presented with shortness of breath and was found to have a right-sided pleural effusion secondary to pulmonary infection. A pigtail drainage tube was inserted guided by computed tomography. The procedure was complicated by the development of a massive hemopneu...

OBJECTIVE Draining of the chest cavity with two chest tubes after pulmonary lobectomy is a common practice. This study aimed to investigate whether using two tubes after a pulmonary lobectomy is more effective than using a single tube. METHOD This prospective randomised study included 100 consecutive patients who underwent lobectomy or bilobectomy for any pathological condition between May 20...

Introduction: In radiotherapy treatment planning system (TPS), basic input is the data from computed tomography (CT) scan, which takes into account the effect of inhomogeneities in dose calculations. Measurement of CT numbers may be affected by scanner-specific parameters. Therefore, it is important to verify the effect of different CT scanning protocols on Hounsfield unit (HU) and its impact o...

OBJECTIVES This study sought to determine updated conversion factors (k-factors) that would enable accurate estimation of radiation effective dose (ED) for coronary computed tomography angiography (CTA) and calcium scoring performed on 12 contemporary scanner models and current clinical cardiac protocols and to compare these methods to the standard chest k-factor of 0.014 mSv·mGy-1cm-1. BACKG...

There is a serious and growing concern about the CT dose delivered by diagnostic CT examinations or image-guided radiation therapy imaging procedures. To better understand and to accurately quantify radiation dose due to CT imaging, Monte Carlo based CT scanner models are needed. This dissertation describes the development, validation, and application of detailed CT scanner models including a G...

BACKGROUND Small pigtail catheters appear to work as well as the traditional large-bore chest tubes in patients with traumatic pneumothorax, but it is not known whether the smaller pigtail catheters are associated with less tube-site pain. This study was conducted to compare tube-site pain following pigtail catheter or chest tube insertion in patients with uncomplicated traumatic pneumothorax. ...

BACKGROUND Contralateral pneumothorax following device implantation on the left side has been reported in a few cases. The majority of contralateral pneumothoraces showed evidence of atrial perforation on computed tomography (CT), echocardiography, or chest x-rays and required lead revision. To the best of our knowledge there is only 1 other reported case of contralateral pneumothorax without e...