Final answer:
To overcome the limitations of 2D imaging, 4D imaging can be used as it adds depth and real-time motion elements to imaging, providing a more comprehensive view. Employing isotopes with short half-lives reduces patient radiation exposure. CT scans, MRI, PET scans, and ultrasound are different medical imaging techniques with various purposes in medicine.
Step-by-step explanation:
One solution to the limitations imposed by 2D imaging and superimposition is to utilize 4D imaging. This approach includes the third dimension of depth for structural visualization, plus the fourth dimension of time, adding the element of motion and allowing for real-time imaging. This can be particularly useful in cardiac and prenatal imaging, where movement is a critical factor in diagnosis. In contrast, 2D imaging can obscure or distort views due to the overlapping of structures.
Employing isotopes with short half-lives in medical imaging helps to limit the radiation dose to the patient. This is because isotopes that decay rapidly reduce the amount of time during which radiation is emitted, thus minimizing the exposure duration for the patient.
Different medical imaging techniques such as CT scans, MRI, PET scans, and ultrasound have distinct functions and uses in medicine. CT scans provide detailed cross-sectional images of body structures, MRI is used to visualize soft tissues without radiation, PET scans are useful to assess metabolic activity, while ultrasounds are the least invasive, using sound waves to image the body.