Final answer:
Retrospective reconstruction allows for the visualization of detailed internal images of a patient's body using techniques like SPECT, which has good contrast despite poorer spatial resolution. Modern 3-D holographic displays enhance this visualization further.
Step-by-step explanation:
The portion of the patient that can be visualized through the process of retrospective reconstruction typically refers to the ability to create detailed images of internal structures or regions of interest within a patient's body, using imaging techniques such as single-photon-emission computed tomography (SPECT). SPECT uses nuclear activity within the patient to generate three-dimensional images. While SPECT may have poorer spatial resolution, roughly around 1 cm, it offers good contrast, which is crucial for distinguishing different tissues and structures from one another. Through retrospective reconstruction, health professionals are able to visualize and assess areas that have been previously imaged, often for the purpose of diagnosis or tracking the progress of a condition.
Moreover, with the advancement of technology, 3-D holographic displays based on a stack of images can be used in the medical field to visualize internal organs and tissues with high resolution, facilitating more comprehensive examinations. Thus, by harnessing retrospective reconstruction and other sophisticated imaging techniques, clinicians can view a substantial portion of the patient's internal landscape, which is especially beneficial when dealing with complex diagnoses or conditions requiring detailed visual analysis.