Target Volume Determination 2015

StefanDelorme Division ofRadiology

StefanDelorme Division ofRadiology

StefanDelorme Division ofRadiology

Outline

CT: Strengths

CT: Weaknesses

21.05.14 |

21.05.14 |

21.05.14 |

• Computed tomography • How it works • Strengths • Weaknesses • Magnetic resonance imaging • How it works • Strengths • Weaknesses • Ultrasound • How it works • Strengths • Weaknesses

• Reliable • Geometrically correct • Fast

• Relatively low tissue contrast • Artifacts in neighbourhood to metal • Limited potential for functional imaging • Iionising radiation

• Patient ease and comfort • Minimal motion artifacts • 4D imaging possible

• Density values • Electron density with dual-energy CT • High spatial resolution

StefanDelorme Division ofRadiology

StefanDelorme Division ofRadiology

StefanDelorme Division ofRadiology

Outline

What do we need for an MR image?

Atomic nucleus

21.05.14 |

21.05.14 |

21.05.14 |

• Computed tomography • How it works • Strengths • Weaknesses • Magnetic resonance imaging • How it works • Strengths • Weaknesses • Ultrasound • How it works • Strengths • Weaknesses

We need…

Magnetic moment

• Atomic nuclei • Protons • Magnetic fields

+ +

+

• Static fields • Gradient fields

+

• RF fields ➡ = rotating magnetic fields

Charge

Spin