HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Herzog, C. Articles by Schoepf, U. J. Search for Related Content PubMed PubMed Citation Articles by Herzog, C. Articles by Schoepf, U. J. Social Bookmarking                      What's this? Hotlight (NEW!) What's Hotlight?

Pediatric Cardiovascular CT Angiography: Radiation Dose Reduction Using Automatic Anatomic Tube Current Modulation

¹ Department of Radiology, Medical University of South Carolina, 169 Ashley Ave., Charleston, SC 29425.
² Department of Radiology, Johann Wolfgang Goethe University, Frankfurt, Germany.
³ Siemens Medical Solutions, Forchheim, Germany.

View larger version (97K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1A —Three different examples of congenital vascular abnormalities of chest evaluated with 64-MDCT with use of automatic tube current modulation. Oblique coronal maximum-intensity-projection images (upper row) and transverse section images (lower row) of patients scanned at 80 kVp (A and B) and 100 kVp (C). A shows stenotic pulmonary artery (black arrowheads) in 6-month-old girl. Note difference in vessel caliber between right and left pulmonary arteries (white arrowhead). B shows left lower pulmonary vein (llPv) draining (black arrows) in right (rA) instead of left (lA) atrium in 2-year-old boy. ulPv = upper left pulmonary vein, rV = right ventricle, and lV = left ventricle. C shows tetralogy of Fallot with large septal defect (white arrows), overriding ascending aorta (aA), and stenotic pulmonary artery (Pa) in 6-month-old boy.

View larger version (111K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1B —Three different examples of congenital vascular abnormalities of chest evaluated with 64-MDCT with use of automatic tube current modulation. Oblique coronal maximum-intensity-projection images (upper row) and transverse section images (lower row) of patients scanned at 80 kVp (A and B) and 100 kVp (C). A shows stenotic pulmonary artery (black arrowheads) in 6-month-old girl. Note difference in vessel caliber between right and left pulmonary arteries (white arrowhead). B shows left lower pulmonary vein (llPv) draining (black arrows) in right (rA) instead of left (lA) atrium in 2-year-old boy. ulPv = upper left pulmonary vein, rV = right ventricle, and lV = left ventricle. C shows tetralogy of Fallot with large septal defect (white arrows), overriding ascending aorta (aA), and stenotic pulmonary artery (Pa) in 6-month-old boy.

View larger version (91K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1C —Three different examples of congenital vascular abnormalities of chest evaluated with 64-MDCT with use of automatic tube current modulation. Oblique coronal maximum-intensity-projection images (upper row) and transverse section images (lower row) of patients scanned at 80 kVp (A and B) and 100 kVp (C). A shows stenotic pulmonary artery (black arrowheads) in 6-month-old girl. Note difference in vessel caliber between right and left pulmonary arteries (white arrowhead). B shows left lower pulmonary vein (llPv) draining (black arrows) in right (rA) instead of left (lA) atrium in 2-year-old boy. ulPv = upper left pulmonary vein, rV = right ventricle, and lV = left ventricle. C shows tetralogy of Fallot with large septal defect (white arrows), overriding ascending aorta (aA), and stenotic pulmonary artery (Pa) in 6-month-old boy.

View larger version (85K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2A —Two examples of congenital vascular abnormalities of chest evaluated with 16-MDCT. Oblique sagittal multiplanar reformation images (upper row left), coronal maximum-intensity-projection images (upper row right), and transverse section images (lower row) of patients scanned at 120 kVp. A shows tetralogy of Fallot with large septal defect (arrows), overriding ascending aorta (aA), and stenotic pulmonary artery (Pa) in 6-month-old boy. Findings are similar to those in 64-MDCT (Fig. 3A). Image noise appears less for 16-MDCT images; however, differences were statistically not significant. B shows single ventricle (sV) after Blalock-Taussig shunt (arrows) between brachiocephalic (bA) and pulmonary (Pa) arteries in 3-year-old girl.

View larger version (73K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2B —Two examples of congenital vascular abnormalities of chest evaluated with 16-MDCT. Oblique sagittal multiplanar reformation images (upper row left), coronal maximum-intensity-projection images (upper row right), and transverse section images (lower row) of patients scanned at 120 kVp. A shows tetralogy of Fallot with large septal defect (arrows), overriding ascending aorta (aA), and stenotic pulmonary artery (Pa) in 6-month-old boy. Findings are similar to those in 64-MDCT (Fig. 3A). Image noise appears less for 16-MDCT images; however, differences were statistically not significant. B shows single ventricle (sV) after Blalock-Taussig shunt (arrows) between brachiocephalic (bA) and pulmonary (Pa) arteries in 3-year-old girl.

View larger version (88K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3A —Comparison of image quality and image noise in three patients with different types of congenital aortic arch abnormalities (arrows) evaluated with 64-MDCT with use of automatic tube current modulation. All patients are male and under 1 year old. Oblique sagittal maximum-intensity-projection images (upper row) and transverse section images (lower row) of patients scanned at 80 (A), 100 (B), and 120 (C) kVp appear grainier at lower compared with higher beam energy levels, but diagnostic quality is not compromised in any cases. Asterisk in C indicates patent ductus arteriosus in patient with an interrupted aortic arch.

View larger version (74K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3B —Comparison of image quality and image noise in three patients with different types of congenital aortic arch abnormalities (arrows) evaluated with 64-MDCT with use of automatic tube current modulation. All patients are male and under 1 year old. Oblique sagittal maximum-intensity-projection images (upper row) and transverse section images (lower row) of patients scanned at 80 (A), 100 (B), and 120 (C) kVp appear grainier at lower compared with higher beam energy levels, but diagnostic quality is not compromised in any cases. Asterisk in C indicates patent ductus arteriosus in patient with an interrupted aortic arch.

View larger version (79K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3C —Comparison of image quality and image noise in three patients with different types of congenital aortic arch abnormalities (arrows) evaluated with 64-MDCT with use of automatic tube current modulation. All patients are male and under 1 year old. Oblique sagittal maximum-intensity-projection images (upper row) and transverse section images (lower row) of patients scanned at 80 (A), 100 (B), and 120 (C) kVp appear grainier at lower compared with higher beam energy levels, but diagnostic quality is not compromised in any cases. Asterisk in C indicates patent ductus arteriosus in patient with an interrupted aortic arch.

View larger version (71K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4A —Examples of image quality obtained at level of aortic root with 64-MDCT and use of automatic tube current modulation. All patients are male and under 1 year old. Oblique sagittal minimum-intensity-projection images (upper row) and transverse sections (lower row) of patients scanned at 80 (A), 100 (B), and120 (C) kVp. To reduce radiation exposure all patients were scanned in free-breathing technique and without use of ECG gating. Nevertheless, in most cases, ascending aorta and origin of coronary arteries were deemed of diagnostic (grading score > 3) image quality. Note only minimal motion artifacts in myocardium. bpm = beats per minute.

View larger version (82K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4B —Examples of image quality obtained at level of aortic root with 64-MDCT and use of automatic tube current modulation. All patients are male and under 1 year old. Oblique sagittal minimum-intensity-projection images (upper row) and transverse sections (lower row) of patients scanned at 80 (A), 100 (B), and120 (C) kVp. To reduce radiation exposure all patients were scanned in free-breathing technique and without use of ECG gating. Nevertheless, in most cases, ascending aorta and origin of coronary arteries were deemed of diagnostic (grading score > 3) image quality. Note only minimal motion artifacts in myocardium. bpm = beats per minute.

View larger version (67K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4C —Examples of image quality obtained at level of aortic root with 64-MDCT and use of automatic tube current modulation. All patients are male and under 1 year old. Oblique sagittal minimum-intensity-projection images (upper row) and transverse sections (lower row) of patients scanned at 80 (A), 100 (B), and120 (C) kVp. To reduce radiation exposure all patients were scanned in free-breathing technique and without use of ECG gating. Nevertheless, in most cases, ascending aorta and origin of coronary arteries were deemed of diagnostic (grading score > 3) image quality. Note only minimal motion artifacts in myocardium. bpm = beats per minute.

CiteULike

Complore

Connotea

Del.icio.us

Digg

Reddit

Technorati