Which of the following statements about depression is false?

The statement indicating that a CT scan is necessary for diagnosing depression is false because depression is primarily diagnosed through clinical assessment rather than imaging techniques. Mental health professionals evaluate a patient's symptoms, duration of those symptoms, and their impact on daily functioning to make a diagnosis. The criteria outlined in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) guide this process and do not require any physical imaging to confirm the presence of depression.

In this context, it is important to note that while CT scans and other imaging techniques can be used to rule out other medical conditions or to observe the brain in certain cases, they do not provide the definitive diagnostic criteria for depression itself. Thus, reliance on medical imaging is not part of the standard diagnostic procedure for this mental health disorder.