molecular imaging with PET & SPECT


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  • well!
    this was my very first presentation in college.. so plz don't expect a lot haha ! umm i didn't know that it must be written as points(bullets) but people grow and learn :p
    as u may notice in the other presentations.
    Shatha Al-Mushayt
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molecular imaging with PET & SPECT

  1. 1. Molecular Imaging<br />with PET and SPECT<br />Physics of Nuclear Medicine(RAD 311) Presentation-2009<br />Done by: Shatha Jamal Al-Mushait<br />1<br />KSU,CAMS,Raidiological Sciences Department<br />
  2. 2. KSU,CAMS,Raidiological Sciences Department<br />2<br />| The OUTLINE<br />
  3. 3. |INTRODUCTION<br />Imaging has witnessed a rapid growth in recent decades. This <br />successful development was mainly driven by notable technical <br />advances in structural Imaging(i.e. CT and MRI).<br />In parallel, functional imagingcame out as an important step in <br />the diagnostic and prognostic assessment of patients using nuclear,<br />magnetic resonance and ultrasonic techniques. More recently the<br />importance of molecular targets for diagnosis and therapy has <br />been recognized and MOLECULAR IMAGING(MI) introduced to <br />visualize and measure these target structures.<br /> <br />3<br />KSU,CAMS,Raidiological Sciences Department<br />
  4. 4. |WHAT is The MOLECULAR IMAGING ?<br />> is the in vivo and non-invasive imaging of biological processes(functions) at the molecular and cellular level. <br />In vivo  inside a living organism.<br />Non-invasive  doesn't require an (invasive) incision into the body or the removal of biological tissue. <br />SO, it is different from microscopy, which can also produce images at the molecular level, in that microscopy is used on sample that have been removed from the body.<br />Also different from other technologies in that it primarily provides information about functions while others image physical structure(anatomy).<br />> Uses biomarkers to help image various targets. <br />4<br />KSU,CAMS,Raidiological Sciences Department<br />
  5. 5. | PRINCIPLE of MI<br />In order to visualize molecular events non-invasively, imaging<br />agents (radiotracers) need to be designed that interact specifically<br />with appropriate molecular targets involved in the pathophysiology<br />of disease. Once a suitable target has been defined, a ligand<br />(tracer) that binds to the target with high affinity and specificity<br /> needs to be designed. Depending on the imaging modality, a label<br />(radioisotope)has to be linked to the ligand, facilitating the sensitive<br /> detection of the imaging agent in a clinical setting. <br />Finally, the acquired images need to be reconstructed and<br />processed using computer systems.<br />5<br />KSU,CAMS,Raidiological Sciences Department<br />
  6. 6. 6<br />
  7. 7. | Uses of MI in Biomedical and clinical medicine<br />Has two basic applications:<br />1.diagnostic imaging 2.therapy<br /> <br />Diagnostic imaging, to determine the location and extent of targeted molecules<br />for the disease being studied. Abnormalities may be detected very early, often<br />before medical problems can be detected by other diagnostic tests and even<br />before symptoms occur. Such early detection allows a disease to be treated<br />early when there may be a more successful outcome.<br /> <br />Therapy, to treat specific disease-target molecules by adding a therapeutic<br />agent onto the radiotracer. Also contributes to improving the treatment of <br />diseases such as cancer, neurological and cardiovascular diseases by <br />optimizing the pre-clinical and clinical tests of new medication.<br />7<br />KSU,CAMS,Raidiological Sciences Department<br />
  8. 8. 8<br />In the field of Cancer, for example, molecular imaging is playing an increasing role, in particular for drug discovery and assessment of therapeutic response.<br /> So, instead of waiting months to determine if a treatment is working, we are watching the performance of our cancer drugs virtually in real time. This technology is designed to say is your tumor growing or is it going away?! <br />KSU,CAMS,Raidiological Sciences Department<br />
  9. 9. |IMAGING MODALITIES<br />There are different modalities such as the CT, and , as well as other methods that can be used for molecular imaging. <br />Each have their different strengths and weaknesses. <br />The choice of imaging modality for molecular imaging depends on the kind and location of the molecular event that needs to be monitored, as well as the biological questions that need to be <br />answered.<br />> This technology has its roots in nuclear medicine.<br />> PET & SPECT are currently considered as the foundation of nuclear medicine. <br />9<br />PET SPECT <br />KSU,CAMS,Raidiological Sciences Department<br />
  10. 10. SPECT<br />10<br />PET/CT<br />Single Photon Emission <br />Computed Tomography<br />Positron Emission Tomography<br />KSU,CAMS,Raidiological Sciences Department<br />
  11. 11. 11<br />|Mechanism of PET & SPECT <br />Both measures emissions from radiotracers and uses the data gathered by the sensors to produce multicolored two or three-dimensional images of the distribution of the chemicals throughout the target.<br />In PET, positron emitting radioisotope is used. Then, <br />these positrons annihilate with nearby electrons, emitting <br />two opposite direction photons. These photons are then<br />detected by the scanner.(higher resolution)<br />In SPECT, Gamma rays emitting radioisotope is used. Then, the Gamma camera rotates around the interested area and detect gamma rays.(lower resolution)<br />SPECT is often chosen over PET simply as a cost issue, for less equipment is involved and fewer staff is required to perform the tests.<br />KSU,CAMS,Raidiological Sciences Department<br />
  12. 12. 12<br />Maximum intensity projection (MIP) of a typical F-18 FDG whole body PET acquisition<br />SPECT image (bone tracer) of a mouse<br />KSU,CAMS,Raidiological Sciences Department<br />
  13. 13. 13<br />|Conclusion<br />The field is still in its infancy and strong efforts need to <br />continue. But it is becoming increasingly clear that it<br />will bring a new perspective to our understanding of <br />diseases biology and their relevance in the planning of<br />radiation treatments. <br />KSU,CAMS,Raidiological Sciences Department<br />
  14. 14. 14<br />|References<br />Handbook of Experimental Pharmacology - Molecular Imaging II (Springer, 2008)<br /><br /><br /><br /><br /><br />EmissiionTomography: The Fundamentals of PET and SPECT<br /> By Miles N. Wernick, John N. Aarsvold<br /><br /><br />KSU,CAMS,Raidiological Sciences Department<br />