What is the fine-grained topic of the following text: In cases where echocardiographic images are suboptimal or when an unusual cause of heart failure is suspected, and for diagnosis of specific cardiomyopathies, other tests (e.g., cardiac catheterization with hemodynamic measurements, computed tomography, and cardiac magnetic resonance imaging) are used. Only return the topic.
Diagnosis methods for heart failure and specific cardiomyopathies