For New Orleans' mayor Ray Nagin, the psyche of the people is the most critical issue when it comes to recovering from a disaster like Katrina, which devastated more than 90, 000 square miles of land and claimed about 1, 800 lives.

CNN: How New Orleans got its groove back

New Orleans Mayor Ray Nagin and Louisiana Gov. Kathy Blanco -- who have been critical of the federal response after the storm -- also met with Bush, as did Lt.

CNN: Bush gets ground tour of Katrina damage

David Miles, the chairman of the radiotherapy specialist focus group of the Association of X-ray Equipment Manufacturers which formed to highlight the problem, says there has been a "collapse in critical investment".

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