OBJECTIVE: The usefulness of a test bolus of contrast medium for predicting the optimal scan delay time in spiral CT-angiography (CTA) was determined. MATERIALS AND METHODS: Two axial single level CT studies were performed at the level of the pancreas in 20 patients, first after injection of a 12 ml "test" bolus, second after administration of a 90 ml bolus. The time interval between the start of the test bolus injection and peak aortic enhancement (T-peak) was measured and compared with the time required to reach a 50, 100, and 150 HU level of aortic enhancement after 90 ml bolus injection. RESULTS: The time required to reach 50, 100, and 150 HU enhancement during the 90 ml bolus was largely variable (mean SD 4.9 s). The T-peak varied between 11 and 32 s (mean 20, SD 6.1 s). There was a strong correlation between the T-peak and the time to the different levels of enhancement during the 90 ml bolus (R2 > or = 0.83). The mean time to 50, 100, and 150 HU enhancement was T-peak -3.3 s (SD 2.5 s), T-peak -1.2 s (SD 2.4 s), and T-peak + 1.3 s (SD 2.4 s). CONCLUSION: The injection of a test bolus improves the timing of a spiral CTA acquisition.
OBJECTIVE: The usefulness of a test bolus of contrast medium for predicting the optimal scan delay time in spiral CT-angiography (CTA) was determined. MATERIALS AND METHODS: Two axial single level CT studies were performed at the level of the pancreas in 20 patients, first after injection of a 12 ml "test" bolus, second after administration of a 90 ml bolus. The time interval between the start of the test bolus injection and peak aortic enhancement (T-peak) was measured and compared with the time required to reach a 50, 100, and 150 HU level of aortic enhancement after 90 ml bolus injection. RESULTS: The time required to reach 50, 100, and 150 HU enhancement during the 90 ml bolus was largely variable (mean SD 4.9 s). The T-peak varied between 11 and 32 s (mean 20, SD 6.1 s). There was a strong correlation between the T-peak and the time to the different levels of enhancement during the 90 ml bolus (R2 > or = 0.83). The mean time to 50, 100, and 150 HU enhancement was T-peak -3.3 s (SD 2.5 s), T-peak -1.2 s (SD 2.4 s), and T-peak + 1.3 s (SD 2.4 s). CONCLUSION: The injection of a test bolus improves the timing of a spiral CTA acquisition.
Authors: Andreas H Mahnken; Ernst Klotz; Anja Hennemuth; Bettina Jung; Ralf Koos; Joachim E Wildberger; Rolf W Günther Journal: Eur Radiol Date: 2003-08-06 Impact factor: 5.315
Authors: L Van Hoe; D Vandermeulen; S Gryspeerdt; L Mertens; A L Baert; P Suetens; G Marchal; L Stockx Journal: Eur Radiol Date: 1996 Impact factor: 5.315
Authors: Andreas H Mahnken; Annabella Rauscher; Ernst Klotz; Georg Mühlenbruch; Marco Das; Rolf W Günther; Joachim E Wildberger Journal: Eur Radiol Date: 2006-11-18 Impact factor: 5.315
Authors: Wen Jie Yang; Ke Min Chen; Bo Liu; Li Fang Pang; Huan Zhang; Zi Lai Pan; Fu Hua Yan Journal: Int J Cardiovasc Imaging Date: 2012-05-23 Impact factor: 2.357
Authors: Zhijun Cai; Colbin Erdahl; Kai Zeng; Tom Potts; Melhem Sharafuddin; Osama Saba; Ge Wang; Er-Wei Bai Journal: Biomed Signal Process Control Date: 2008-10 Impact factor: 3.880
Authors: Sock Keow Tan; Kwan Hoong Ng; Chai Hong Yeong; Raja Rizal Azman Raja Aman; Fadhli Mohamed Sani; Yang Faridah Abdul Aziz; Zhonghua Sun Journal: Quant Imaging Med Surg Date: 2019-04