Sensitivity to radiaiton calculating pt dose
Download
1 / 17

Sensitivity to Radiaiton & Calculating pt dose - PowerPoint PPT Presentation


  • 110 Views
  • Uploaded on

Sensitivity to Radiaiton & Calculating pt dose. Stat ch 8 Bush ch 40. Tissue and Cell Sensitivity to Radiation. Most Sensitive: Reproductive organs Blood-forming organs Skin Bone and teeth. Least sensitive : Muscle Nervous system. Tissue Radiation Sensitivity.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Sensitivity to Radiaiton & Calculating pt dose' - leah-joyner


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Sensitivity to radiaiton calculating pt dose

Sensitivity to Radiaiton&Calculating pt dose

Stat ch 8

Bush ch 40



Tissue radiation sensitivity

Most Sensitive:

Reproductive organs

Blood-forming organs

Skin

Bone and teeth

Least sensitive:

Muscle

Nervous system

Tissue Radiation Sensitivity




Why cancer risks at low doses are uncertain
Why cancer risks at low doses are uncertain

  • It has been difficult to estimate cancer induction risks, because most of the radiation exposures that humans receive are very close to background levels.

  • At low dose levels of millirems to tens of rems, the risk of radiation-induced cancers is so low,

  • that if the risk exists, it is not readily distinguishable from normal levels of cancer occurrence.

  • In addition, leukemia or solid tumors induced by radiation are indistinguishable from those that result from other causes. 


Relative risk of a 1 in a million chance of death from activities common to our society
Relative Risk of a 1 in a million chance of death from activities common to our society:

  • ·Smoking 1.4 cigarettes in a lifetime (lung cancer)

  • Eating 40 tablespoons of peanut butter (aflatoxin)

  • Spending two days in New York City (air pollution)

  • Driving 40 miles in a car (accident)

  • Flying 2500 miles in a jet (accident)

  • Canoeing for 6 minutes (drowning)

  • Receiving a dose of 10 mrem of radiation (cancer)


Patient dose
PATIENT DOSE

  • RAD

  • MR/MAS PER EXPOSURE - At each kVp level – there is a determined output for each radiographic room

  • EX 70 kvp = 2.5 mr/mas

  • ABD done 70 kVp, 20 mas

  • 2.5 x 20 = 50 mR for that one exposure.

  • LOOK AT formula: mr/mas Ch 8 Stat

  • CH 40 BUSHONG


  • “AVE” CHEST EXPOSURE - 2 IMAGES

  • (Ave – Pt meas 23cm pa 40cm lat)

  • PA 110 KVP 5 MAS 16:1 GRID 400RS 72”

  • LAT 110 KVP 20 MAS 16:1 GRID 400 RS 72”

  • WHAT IS THE PATIENT’S DOSE??


  • “AVE” CHEST EXPOSURE - 2 IMAGES

  • WHAT IS THE PATIENT’S DOSE??

  • OUTPUT OF TUBE NEEDED:

  • PA Chest = mr/mas = 9.5

  • LAT 110 KVP 20 MAS 16:1 GRID 400 RS 72”







ad