Clinical Medical Physics at CSU VTH

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15 Νοε 2013 (πριν από 3 χρόνια και 11 μήνες)

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Clinical Medical Physics at CSU VTH

What is medical Physics?


An applied branch of physics concerned with the application of the concepts and methods of physics to the diagnosis

and treatment of disease


In order to practice medical physics, one must have an appropriate advanced degree (M.S. or Ph.D.), formal clinical

training (residency), board certification (e.g. American Board of Radiology) and, in most states, a license or registration

Example of orthogonal pair of radiographs, obtained at time of
radiotherapy treatment, compared to digitally reconstructed radiographs
generated from CT based plan.

What does a medical physicist do in a clinical setting?


Medical physicists contribute to the effectiveness of radiological imaging procedures by assuring radiation safety and improv
ing

imaging techniques


They contribute to development of therapeutic techniques, collaborate with radiation oncologists to design treatment plans, a
nd
monitor equipment and

procedures to ensure that cancer patients receive the prescribed dose of radiation to the correct location


Medical
-
Health

Physics

Medical Nuclear Physics

Secondary
Collimation

Target

Flattening Filter

Ion Chambers

Primary Collimator

Physical Wedge

e
-

High Contrast Resolution

Low Contrast Performance

CT Performance Phantom

Sensitometry

Image Guided Radiation Therapy (IGRT)

Intensity Modulated Radiation Therapy (IMRT)
QA

Example of typical quality assurance (QA) testing performed for patient
specific IMRT treatment. Complex dose distribution created by moving
Tungsten leaves is measured and compared to the calculated dose.

Development of Patient Specific Treatment
Devices

Commissioning and Testing of Medical Linear Accelerators

Diagnostic Radiology Image Quality & Radiation Safety Testing

0
100
200
300
400
500
-50
0
50
Dose (cGy)

mm

7
-
Field

Vertical Axis

EBT
Film
MRI Performance Phantom

Examples of MRI Phantom Images

PET & SPECT Performance Phantom

Example of PET Phantom Image

Example of Ultrasound
Phantom Image

Antimatter
used in
PET
Imaging!

Example of Water Phantoms, Ion Chambers &
Electrometer used for Radiotherapy
Calibration and Beam Data Collection

Example of Photon and Electron Beam Data Collected for
Trilogy Linear Accelerator. Data us used by State
-
of
-
the
-
Art
Calculation Algorithm to Plan Patient Treatments.

Photon Depth Dose

Impact of Metal Wedge
on Beam Profile

Photon Beam Profiles

Electron Depth
Dose

Development of Phantoms for Special
Dosimetry Studies

2
-
D Comparison of
Isodose Curves

2
-
D “Gamma”
Analysis

1
-
D Analysis of Isodose Profiles

Each of the 7 Beams in this Plan Generates a Unique Fluence
Pattern (example in upper right) using the MLC device (upper
left) Customized for the Tumor

Limb Phantom and Radiochromic Film used to Characterize Skin Dose for Osteosarcoma Patients

Cranial Immobilization Device Developed for Canine & Feline Radiotherapy Patients

High Energy e
-