PET Scans

2,365 views

Published on

Published in: Health & Medicine, Technology
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
2,365
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
188
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

PET Scans

  1. 1. PET Scans
  2. 2. What i s a PET Scan? Def i ni t i on: • A Posi t ron emi ssi on t omography ( PET) scan i s a nucl ear medi cal i magi ng t echni que whi ch produces a t hree- di mensi onal i mage of f unct i onal processes i n t he body.
  3. 3. Hi st ory of t he P. E. T scan• The concept of emi ssi on and t r ansmi ssi on t omogr aphy was i nt r oduced by Davi d E. Kuhl and Roy Edwar ds i n t he l at e 1950s at t he Uni ver si t y of Pennsyl vani a. • I n t he 1970s, Tat suo I do at t he Br ookhaven Nat i onal Labor at or y was t he f i r st t o descr i be t he synt hesi s of 18F- FDG, t he most commonl y used PET scanni ng i sot ope car r i er . • As you can see t her e i s not one per son who devel oped t he PET scan
  4. 4. How i t works 1. A shor t - l i ved r adi oact i ve t r acer i sot ope, i s i nj ect ed i nt o t he l i vi ng subj ect ( usual l y i nt o bl ood ci r cul at i on) . The t r acer i s chemi cal l y i ncor por at ed i nt o a bi ol ogi cal l y act i ve mol ecul e. 2. Ther e i s a wai t i ng per i od whi l e t he act i ve mol ecul e becomes concent r at ed i n t i ssues of i nt er est . 3. As t he r adi oi sot ope under goes
  5. 5. 4. Af t er t r avel i ng up t o a f ew mi l l i met er s t he posi t r on encount er s an el ect r on. 5. The encount er anni hi l at es t hem bot h, pr oduci ng a pai r of ( gamma) phot ons movi ng i n opposi t e di r ect i ons. 6. These ar e det ect ed when t hey r each a sci nt i l l at or i n t he scanni ng devi ce, cr eat i ng a bur st of l i ght whi ch i s det ect ed by phot omul t i pl i er t ubes. 7. The t echni ci ans can t hen cr eat e an i mage of t he par t s of your br ai n,
  6. 6. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Di agram Di agram
  7. 7. The Tracer • The radi oi sot opes used i n PET scans are i sot opes of carbon, ni t rogen, oxygen and 18F used as a subst i t ut e f or hydrogen. • These are t he onl y radi oact i ve f orms of nat ural el ement s t hat wi l l pass saf el y t hrough your body and be det ect ed by t he scanner. • The t ype of t racer used depends on what your doct or want s t o measure. For exampl e, i f your doct or i s
  8. 8. Compari son wi t h a MRI scan• When peopl e go i n f or a ‘ scan’ i t i s most l i kel y a Magnet i c Resonance I magi ng scan. So what ’ s t he di f f erence bet ween t he t wo scans? • A MRI scan does not use nucl ear medi ci ne, i t creat es an i mage usi ng magnet s. • A MRI scan can assess t he si ze and shape of body organs and t i ssue. However, t hey cannot assess f unct i on. A PET scan l ooks at f unct i on. • I n ot her words, MRI scans t el l you what somet hi ng l ooks l i ke, whi l e a PET scan can
  9. 9. Pi ct ure QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture.
  10. 10. Xray i mage PET scan i mage MRI scan i mage Ul t rasound i mage

×