Nuclear medicine is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease. Nuclear medicine, in a sense, is "radiology done inside out" or "endoradiology" because it records radiation emitting from within the body rather than radiation that is generated by external sources like X-rays. In addition, nuclear medicine scans differ from radiology as the emphasis is not on imaging anatomy but the function and for such reason, it is called a physiological imaging modality. Single photon emission computed tomography (SPECT) and positron emission tomography (PET) scans are the two most common imaging modalities in nuclear medicine.
A positron emission tomography (PET) scan is an imaging test that allows your doctor to check for diseases in your body.
The scan uses a special dye containing radioactive tracers. These tracers are either swallowed, inhaled, or injected into a vein in your arm depending on what part of the body is being examined. Certain organs and tissues then absorb the tracer.
When detected by a PET scanner, the tracers help your doctor to see how well your organs and tissues are working.
The tracer will collect in areas of higher chemical activity, which is helpful because certain tissues of the body, and certain diseases, have a higher level of chemical activity. These areas of disease will show up as bright spots on the PET scan.
The PET scan can measure blood flow, oxygen use, how your body uses sugar, and much more.
A PET scan is typically an outpatient procedure. This means you can go about your day after the test is finished.
In the United States, around 2 million PET scans are performed each year.
20. Picture Archiving and Communication System (PACS) :
،ضبطانتقالوذخيرهسازيديجيتاليتصاويرتشخيصي.
سيستمPACSمتشكلازايستگاههايكاريدرراستايتفسير،مدلسازيدادههامي،باشد
عملكردتوزيع،چاپوضبطپروندههاازطريقيكوبسرورصورتميپذيرد،سرور
برايانتقالوآرشيواطالعاتبصورتآفالينعملميكند.درراستايعملكرداينسيستم
يككامپيوترمتصلبهشبكهبرايهريكازايندستگاههاموردنيازاست.
ارامغناطیس شکلی از خاصیت مغناطیسی مواد است که به واسطه آن برخی از مواد به وسیلهٔ میدان خارجی اعمال شده جذب میشوند. مواد پارامغناطیس شامل بیشتر عناصر شیمیایی و برخی از ترکیبات میشوند
حفاظت مغناطیسی اندازه گیری میدانهای بسیار ضعیف در بسیاری از صنایع مانند تجهیزات تشخیص پزشکی اهمیت بسیار زیادی دارد. در این راستا استفاده از محفظه حفاظت میدان مغناطیسی ایستا روشی معمول در جهت کاستن از میدان مغناطیسی ناخواسته در این تجهیزات است.
Positron Emission Tomography (PET) is a non-invasive method for imaging human biochemical and physiological processes in vivo