OBJECT: The aim of our study is to determine if the respiratory position (free breathing, end expiration) influences bolus arrival time (BAT) or the quality of the SI-time curve in the test bolus measurement. MATERIALS AND METHODS: We examined 150 consecutive patients in free breathing and end expiration with 1 mL contrast media (CM) and a flow of 3 mL/s with MRI. The BAT in the aorta and the quality of the SI-time curve were determined. RESULTS: In 13/300 measurements BAT could not be determined because of poor quality of the SI-time curve (two free breathing, 11 end expiration). Mean BAT was 21 s in both respiratory positions. In 13/137 (9%) there was a difference in BAT in end expiration and free breathing of more than 5 s without a tendency towards elongation or shortening of BAT due to the respiratory command (RC). Quality of the SI-time curve was significantly better in the second of both measurements independently of the respiratory position and in free breathing compared to end expiration. CONCLUSION: Test bolus examinations may differ in an individual patient of more than 5 s without a tendency towards elongation or shortening due to the RC. SI-time curve quality is negatively influenced by the RC.
OBJECT: The aim of our study is to determine if the respiratory position (free breathing, end expiration) influences bolus arrival time (BAT) or the quality of the SI-time curve in the test bolus measurement. MATERIALS AND METHODS: We examined 150 consecutive patients in free breathing and end expiration with 1 mL contrast media (CM) and a flow of 3 mL/s with MRI. The BAT in the aorta and the quality of the SI-time curve were determined. RESULTS: In 13/300 measurements BAT could not be determined because of poor quality of the SI-time curve (two free breathing, 11 end expiration). Mean BAT was 21 s in both respiratory positions. In 13/137 (9%) there was a difference in BAT in end expiration and free breathing of more than 5 s without a tendency towards elongation or shortening of BAT due to the respiratory command (RC). Quality of the SI-time curve was significantly better in the second of both measurements independently of the respiratory position and in free breathing compared to end expiration. CONCLUSION: Test bolus examinations may differ in an individual patient of more than 5 s without a tendency towards elongation or shortening due to the RC. SI-time curve quality is negatively influenced by the RC.
Authors: Y Watanabe; M Dohke; A Okumura; Y Amoh; T Ishimori; K Oda; T Hayashi; A Hiyama; Y Dodo Journal: Radiographics Date: 2000 Jan-Feb Impact factor: 5.333
Authors: Stephanie M Shors; William G Cotts; Biljana Pavlovic-Surjancev; Christopher J François; Mihai Gheorghiade; J Paul Finn Journal: Radiology Date: 2003-12 Impact factor: 11.105