30,863 research outputs found
Application of CT in Diagnosing Carcinoma of the Maxillary Sinuses : PART 2: An Experimental Study of Pitfalls Encountered when Diagnosing Carcinoma of the Maxillary Sinuses with CT
No full text1982-03A phantom simulating the transverse section of the maxillary sinuses was constructed for experimentation with various CT scanners to study the following: (1) the occasional inability to image the very thin posterior-lateral walls which have no real bone defects, and (2) to verify whether or not the bony walls surrounding the maxillary sinuses are actually as thick as they appear on CT. The phantom was made of an acrylic cylinder containing three cavities simulating the maxillary sinuses and the nasal cavity and filled with water. The walls, made of thin aluminum and acrylic plates and placed between water and air, disappeared in some CT images. The thickness of the walls calculated from CT values was greater than the true thickness imaged by each CT scanner. The author stresses that in CT images, either experimentally or clinically, thin bony walls placed between water and air or fat tend to disappear, and that bony walls tend to appear thicker than their true thickenss.departmental bulletin pape
Talks delivered plant science day
No full textAnnual; Description based on: Aug. 5, 1998; title from caption (publisher's web ste, viewed Apr. 13, 2007).; Latest issue consulted: Aug. 2, 2006.; Harvested from the web on 4/13/0
Talks delivered plant science day
No full textAnnual; Description based on: Aug. 5, 1998; title from caption (publisher's web ste, viewed Apr. 13, 2007).; Latest issue consulted: Aug. 2, 2006.; Harvested from the web on 4/13/0
Talks delivered plant science day
No full textAnnual; Description based on: Aug. 5, 1998; title from caption (publisher's web ste, viewed Apr. 13, 2007).; Latest issue consulted: Aug. 2, 2006.; Harvested from the web on 4/13/0
Comparison of low-dose CT with CT/CT fluoroscopy guidance in percutaneous sacral and supra-acetabular cementoplasty
No full textPURPOSEPercutaneous cementoplasty is a minimally invasive treatment modality for painful osteoporotic and pathologic sacral and supra-acetabular iliac fractures. This study compares the use of low-dose CT guidance with CT/CT fluoroscopy in sacral and supra-acetabular cementoplasty.METHODSA retrospective review of patients who had undergone sacral or supra-acetabular cementoplasty was performed with patients grouped by use of CT/CT fluoroscopy or low-dose CT guidance during the procedure. Parameters evaluated included type of fracture, laterality of lesions, pain scores, pain medication use, imaging parameters, procedure time, dose-length product, effective dose, cement volume, and complications.RESULTSThere were 17 patients identified who underwent cementoplasty utilizing dual CT/CT fluoroscopy, while 13 patients had their procedures performed with low-dose CT. There was a statistically significant decrease in radiation dose in the low-dose CT group (1481 mGy·cm) compared with the CT/CT fluoroscopy group (2809 mGy·cm) (P = 0.013). There was a significant decrease in procedure time with low-dose CT for bilateral lesions (P = 0.016). There was no significant difference between groups in complication rate (P = 0.999). Clinically nonsignificant cement extravasation occurred in two patients (10%) in the CT/CT fluoroscopy group and in one patient (8%) in the low-dose CT group (P = 0.999). There was a significant decrease in pain scores compared with baseline on the visual analogue scale in both groups at 1 week (low-dose CT P = 0.002, CT/CT fluoroscopy P = 0.008) and 1 month postprocedure (low-dose CT P = 0.014, CT/CT fluoroscopy P = 0.004), but no difference between groups at 1 day (P = 0.196), 1 week (P = 0.368), or 1 month (P = 0.514).CONCLUSIONSacral and supra-acetabular cementoplasties can be performed safely and precisely using low-dose multiple-acquisition CT guidance while providing significant radiation dose reduction with no difference in extravasation rates, postprocedural pain reduction, and complications compared with CT/CT fluoroscopy
Talks delivered plant science day
No full textAnnual; Description based on: Aug. 5, 1998; title from caption (publisher's web ste, viewed Apr. 13, 2007).; Latest issue consulted: Aug. 2, 2006.; Harvested from the web on 4/13/0
Talks delivered plant science day
No full textAnnual; Description based on: Aug. 5, 1998; title from caption (publisher's web ste, viewed Apr. 13, 2007).; Latest issue consulted: Aug. 2, 2006.; Harvested from the web on 4/13/0
Talks delivered plant science day
No full textAnnual; Description based on: Aug. 5, 1998; title from caption (publisher's web ste, viewed Apr. 13, 2007).; Latest issue consulted: Aug. 2, 2006.; Harvested from the web on 4/13/0
Talks delivered plant science day
No full textAnnual; Description based on: Aug. 5, 1998; title from caption (publisher's web ste, viewed Apr. 13, 2007).; Latest issue consulted: Aug. 2, 2006.; Harvested from the web on 4/13/0
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