Truncated correlation photothermal coherence tomography (TC‐PCT) is a pulse‐compression, matched‐filter‐based photothermal diffusion‐wave imaging modality with a proven track record in non‐destructive evaluation of biomedical, dental, art‐object and industrial applications. This is a study of the effect thermal transient truncation plays in the TC‐PCT algorithm. It introduces a new phase channel which was coined the name Linear Iso Phase (LIOP) and improves the conventional TC‐PCT phase by redevising its matched‐filter sampling scheme and removing the effect of circular aliasing artifacts introduced in the frequency‐domain‐transformed cross‐correlation (CC) calculations. A previously introduced computationally simplified adaptation to TC‐PCT based on conventional CC signal processing, named enhanced truncated correlation photothermal coherence tomography (eTC‐PCT), which does not utilize thermal transient truncation is also investigated: The TC‐PCT and eTC‐PCT algorithms and the LIOP channel are used to produce three‐dimensional reconstructions of a complex multi‐layered marquetry art sample and a tooth with a bacterial‐induced lesion.