I am glad I have helped you :)
A CT scah of the abdomen does not show the stomach that well...if there is a concern regarding the lining of the stomach (ulcer, for example) a scope of the stomach is really what you need.
The diaphragm is usually visualized on the CT scan as is the base of the lungs
The intestines are also visualized but a CT scan is not the test of choice for certain intestinal problems.
For example, it will not pick up small polyps but it will pick up inflammation of the colon, obstructions, narrowing or scarring of the colon, diverticulitis...
So, it all depends on what you are looking for as to whether the CT scan is the appropriate test.
With chronic bloating, this is often due to foods that you eat, irritable bowel (all testing will be normal), or possible malabsorption if you also have diarrhea (such as celiac or lactose intolerance).
Let me know if you have further questions....