Modality specific impairments are divided into separate subsystems on the basis of input modality. Interferon is being studied as a therapeutic modality. Gynecologic ultrasonography is the imaging modality of choice. Further studies are underway on this therapeutic modality. MRI is one modality for diagnosis cardiac sarcoidosis. Tissue biopsy is the diagnostic modality of choice. Photoacoustic imaging is a recently developed hybrid biomedical imaging modality based on the photoacoustic effect. It is calculated using Doppler echocardiography, an ultrasound-based cardiac imaging modality. It has become the preferred imaging modality for suspected aortic dissection. This stimulator ultimately stimulates a functioning sensory modality. Perceptual priming is sensitive to the modality and exact format of the stimulus. For such reason, it is called a physiological imaging modality. Immunotherapy is a more recent treatment modality that is still in development. More research is needed to establish the role of each treatment modality. It has been suggested that the immune system is an overlooked sensory modality.