Kuvantamislähde

Kuvantamislähde refers to the source of radiation used in medical imaging techniques. Different imaging modalities employ distinct types of kuvantamislähde to generate the signals necessary for creating diagnostic images. In X-ray imaging, the kuvantamislähde is typically an X-ray tube, which produces high-energy photons when a beam of electrons is accelerated and strikes a metal target. Computed tomography (CT) scans also utilize X-ray tubes as their kuvantamislähde, but these tubes rotate around the patient to acquire multiple projections. For fluoroscopy, a continuous or pulsed X-ray beam from an X-ray tube serves as the kuvantamislähde. In contrast, nuclear medicine imaging techniques, such as positron emission tomography (PET) and single-photon emission computed tomography (SPECT), use radioactive isotopes as their kuvantamislähde. These isotopes, administered to the patient, emit gamma rays or positrons that are detected by specialized cameras. Magnetic resonance imaging (MRI) does not rely on ionizing radiation as its kuvantamislähde; instead, it uses strong magnetic fields and radiofrequency pulses to interact with the atomic nuclei within the body. Ultrasound imaging, another non-ionizing technique, employs transducers that generate and detect sound waves as its kuvantamislähde. The choice of kuvantamislähde is fundamental to the underlying physics of the imaging modality and dictates its diagnostic capabilities, safety profile, and applications.