Technical Aspects of Cardiac CT - ImPACT CT Scanner Evaluation ...

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Cardiac scanner spatial resolution • Scanner limiting spatial resolution: – Scan plane: up to 25 lp/cm (0.2 mm) – Z-axis: up to 15 lp/cm (0.33 mm) • Sharpest filters not utilised in cardiac CTA – high noise Line pair (object plus gap) 10 lp/cm ≡ 0.5 mm Harefield Cardiac Course Images from Lin, EC et al; http://emedicine.medscape.com/article/1603072-overview
Cardiac scanner spatial resolution • For standard cardiac scans – Scan plane: ~ 8 lp/cm (0.6 mm) – Z-axis: ~ 13 lp/cm (0.4 mm) • For reduced ‘blooming’ e.g. stents, calcium – sharper filters may be used scan plane ~ 10 lp/cm (0.5 mm) Courtesy Siemens Harefield Cardiac Course Images from Lin, EC et al; http://emedicine.medscape.com/article/1603072-overview
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Technical Aspects of Cardiac CT S.
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Cardiac CT • Godfrey Hounsfield,
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Applications of cardiac CT • Calc
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Modern multi-slice scanners • 199
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The scanner Y Y X X Z Z Typical det
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Beam width, detectors and slices
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Scanner rotation speeds 0.3 Second
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Helical (spiral) scanning • Conti
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Helical (spiral) scanning - pitch p
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Harefield Cardiac Course
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• Analytical techniques Image rec
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• Volume set of data Image presen
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• Heart rate The heart - Average
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Cardiac CT - ECG phases • To ‘f
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Cardiac CT - ECG phases • 2 defin
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Cardiac CT - ECG phases • For hig
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Cardiac CT - scan modes Scan Axial
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Cardiac CT- axial scanning • Imag
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Cardiac CT - axial scanning with pa
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Cardiac CT - helical scanning • S
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0% 5% 10% 15% 20% 25% 30% 35% 40% 4
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Helical cardiac CT- ECG dose modula
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Helical cardiac CT - pitch • Gant
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Helical cardiac CT - pitch • Requ
Page 49 and 50: Technical Aspects of Cardiac CT •
Page 51 and 52: Techniques to improve temporal reso
Page 53 and 54: Multi-sector reconstruction • Use
Page 55 and 56: Multi-sector reconstruction • Two
Page 57 and 58: Multi-sector reconstruction 2 secto
Page 59 and 60: Multi-sector reconstruction - issue
Page 61 and 62: Multi-sector reconstruction - issue
Page 63 and 64: Two tubes - Siemens Dual Source •
Page 65 and 66: Challenges in imaging the heart - v
Page 67 and 68: Volume coverage • Scanner detecto
Page 69 and 70: Volume coverage • Motion needs to
Page 71 and 72: • Heart rate The heart - Average
Page 73 and 74: Volume coverage - axial scan • Nu
Page 75 and 76: Philips Brilliance iCT 8 cm coverag
Page 77 and 78: Volume coverage - overlap • Small
Page 79 and 80: Volume coverage - single beat • S
Page 81 and 82: Volume coverage - single beat high
Page 83 and 84: • Improved temporal resolution -
Page 85 and 86: Image quality issues - spatial reso
Page 87 and 88: Double sampling - Z-axis • 32 det
Page 89 and 90: Spatial resolution - Z-axis • Min
Page 91 and 92: Spatial resolution - display • Op
Page 93 and 94: Cardiac CT - scan modes Scanning mo
Page 95 and 96: What do you need on a cardiac scann
Page 97 and 98: • This talk and others - www.impa
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