What is meant by "4D CT" imaging?

"4D CT" imaging refers to the integration of the dimension of time into traditional three-dimensional CT imaging. In this context, the "4th dimension" represents time, allowing for the dynamic assessment of structures that change position or shape over time, such as during the respiratory cycle. This capability is particularly beneficial for analyzing motion, such as breathing or the beating of the heart, which is critical for accurate diagnosis and treatment planning in various medical conditions.

In a traditional 3D CT scan, multiple images are taken from various angles and reconstructed to form a three-dimensional representation of the anatomy. However, adding the fourth dimension enables clinicians to observe and understand changes that occur over time, enhancing the evaluation of dynamic processes in the body. This is especially useful in treatment planning for certain cancers or in respiratory therapies, where the movement of tissues can significantly affect the outcome of procedures.

Understanding this advance in imaging technology helps in comprehending how motion can impact diagnoses and treatments, making 4D CT a valuable tool in modern medical imaging.