Radiation Therapy and FYI

External Beam Radiation Therapy

(Teletherapy) penetrating radiation from a distance.

1. IGRT Image Guided Radiation Therapy

2. IMRT Intensity Modulated RT

3. 3D conformal RT

Internal Radiation Therapy (BrachyTherapy)

localized radiotherapy where radioactive source is implanted to tumor

Systemic Radiation Therapy

Radioactive substance is given into body to locate and target tumor cell, injection by blood or orally

Irradiation Therapy as Curative Therapy

Radiation Therapy kills cancer cells or slows down growth

Radiation Therapy as Palliative Treatment

Relieves symptoms and improves patients quality of life by relieving or minimizing pain. Shrink tumor so patients with advanced cancer are more comfortable.

NRCP Report #116

Limitations of exposure to ionizing radiation. Defines the principles of radiation exposure. Prevent short term and long term consequences resulting from radiation exposure. Reduces stochastic effects as much as possible for exams being done for the benefit done for the benefit of the person being exposed.

FGP Fluoroscopy Guided Positioning

The practice of using fluoroscopy for routine non fluoroscopic radiographic images and ARRT considers this practice unethical practice as it unnecessarily increases patient dose and should never be used in place of appropriate skills required of a competent RT

Properly Compressed breast contact no grid mammography should not exceed

1 mGyt per view

Proper lot compressed breast with grid mammography should not exceed

3 mGyt per view

ESE per view in Mammography

8 mGya per view

What percentage of the ESE is grandular dose

15%

Recommended Yearly dose limit for radiation worker

50 mSv/ yr

Recommended Yearly dose limit for General public and student under age 18

1 mSv/yr

Dose limit for

Skin

Extremity

Lens of eye

500 mSv

500 mSv

150 mSv

Monthly equivalent dose to the embryo should not exceed

0.5 mSv

Mobile unit long enough to stand how far from patient

2-3 meters

X-ray attentnuation for .25mm lead equivalency

66% at 75kVp

Constant operation unit of measurement assumed for general imaging and mammo

100 and 30 kvp