True or false: Diagnostic CT can be used for purposes of CT planning.

Diagnostic CT scans are generally not suitable for CT planning in radiation therapy. The primary reason is that diagnostic CTs are optimized for image quality and low radiation dose, focusing on visualizing anatomical structures rather than providing the necessary data for precise radiation treatment planning.

In radiation therapy planning, it is crucial to have images that accurately define the target volume and critical structures, requiring high-quality datasets for dose calculations and treatment planning. The images obtained from treatment planning CT scans are specifically taken with the goal of obtaining optimal spatial resolution, superior contrast, and detailed information about the tumor and surrounding tissues.

While there may be rare instances in which diagnostic CT images can provide some useful information, they typically do not meet the required standards for accuracy and detail necessary for effective radiation therapy planning. Therefore, considering the essential needs of radiation treatment planning, the assertion that diagnostic CT can be used for CT planning is false.