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Latest C. Daniel Johnson Stories

2012-02-23 11:36:12

Computed tomography (CT) colonography can be used as a primary screening tool for colorectal cancer in adults over the age of 65. Some previous medical studies have found no significant difference in the diagnostic accuracy of CT colonography, also known as "virtual colonoscopy," and traditional optical colonoscopy. This study looks at whether both exams are as effective for adults over 65 as they are for adults between 50 and 65 years of age. In the study, C. Daniel Johnson, M.D.,...

2010-10-04 13:31:36

Researchers working in a radiology department at a mid-sized hospital were able to increase productivity and improve efficiency by developing a simple method for measuring general technologist productivity, according to a study in the October issue of the Journal of the American College of Radiology (www.jacr.org). "Improving productivity and maintaining team spirit are often competing priorities that may be difficult to achieve simultaneously," said C. Daniel Johnson, MD, co-author of the...

2010-06-22 01:56:52

CTC can now use only one-quarter of the dose of an abdominal CT scan A newly adapted low-dose computed tomography (CT) technique called adaptive statistical iterative reconstruction (ASIR) can help radiologists reduce the already low radiation dose delivered during CT colonography (CTC) by another 50 percent, according to a study published in the July issue of the American Journal of Roentgenology (www.ajronline.org). ASIR is a technique that allows radiologists to reduce the noise in an...


Word of the Day
negawatt
  • A unit of saved energy.
Coined by Amory Lovins, chairman of the Rocky Mountain Institute as a contraction of negative watt on the model of similar compounds like megawatt.