Figure 1.

Schematic of using a line-scan protocol to create space-time images under ideal recording conditions and when artifacts are present. (A) Full-frame image showing an RBC traveling inside a vessel. The line-scan path is represented as a red line (in top panels) and a stack of sequential line-scans shows the RBC at four different locations in the vessel (bottom panels). (B) Repeated line-scans through the identical location in the vessel (top panel) results in a space-time image that has a diagonal RBC streak (bottom panel). (C) A line-scan path that goes outside the vessel (top panel) results in a time-invariant artifact, represented as a black vertical band in the line-scan image (bottom panel). (D) Movement of the vessel relative to the line-scan path (top panel) results in a time-varying artifact, represented by the variable width of the black band in the line-scan image (bottom panel).