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

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Heart rates and required imaging times Heart rate (Beats per min.) Heart rate (Beats per sec.) Time for one beat (R-R) (sec.) Useful ‘still’ time ~ 10% of (R-R) 40 0.7 1.5 sec 150 ms 60 1 1 sec 100 ms 120 2 0.5 sec 50 ms Harefield Cardiac Course Typical scanners: shortest rotation times Rotation times (sec) Half rot. time (ms) 0.27 135 ms 0.33 165 ms 0.4 200 ms 0.5 250 ms
Techniques to improve temporal resolution • Patient – Aim for a slow and regular heart rate (beta blockers) Harefield Cardiac Course
Page 1 and 2: Technical Aspects of Cardiac CT S.
Page 3 and 4: Cardiac CT • Godfrey Hounsfield,
Page 5 and 6: Applications of cardiac CT • Calc
Page 7 and 8: Modern multi-slice scanners • 199
Page 9 and 10: The scanner Y Y X X Z Z Typical det
Page 11 and 12: Beam width, detectors and slices
Page 13 and 14: Scanner rotation speeds 0.3 Second
Page 15 and 16: Helical (spiral) scanning • Conti
Page 17 and 18: Helical (spiral) scanning - pitch p
Page 19 and 20: Harefield Cardiac Course
Page 21 and 22: • Analytical techniques Image rec
Page 23 and 24: • Volume set of data Image presen
Page 25 and 26: • Heart rate The heart - Average
Page 27 and 28: Cardiac CT - ECG phases • To ‘f
Page 29 and 30: Cardiac CT - ECG phases • 2 defin
Page 31 and 32: Cardiac CT - ECG phases • For hig
Page 33 and 34: Cardiac CT - scan modes Scan Axial
Page 35 and 36: Cardiac CT- axial scanning • Imag
Page 37 and 38: Cardiac CT - axial scanning with pa
Page 39 and 40: Cardiac CT - helical scanning • S
Page 41 and 42: 0% 5% 10% 15% 20% 25% 30% 35% 40% 4
Page 43 and 44: Helical cardiac CT- ECG dose modula
Page 45 and 46: Helical cardiac CT - pitch • Gant
Page 47 and 48: Helical cardiac CT - pitch • Requ
Page 49: Technical Aspects of Cardiac CT •
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
Page 99 and 100: Technical Aspects of Cardiac CT S.
Page 101:
Cardiac scanner spatial resolution
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