Types segmentation classifies Imaging Diagnostic Catheters by the underlying sensing technology, principally into intravascular ultrasound (IVUS), optical coherence tomography (OCT), fluoroscopy‑guided, photoacoustic, and hybrid multimodal platforms. IVUS catheters, representing roughly 30 % of market value, dominate because of their established role in plaque characterization and vessel sizing across coronary and peripheral procedures. OCT devices, accounting for about 28 %, offer higher axial resolution, which drives adoption in complex lesion assessment and stent optimization despite higher procedural cost. Fluoroscopy‑guided catheters, contributing 22 %, remain essential for real‑time navigation in anatomically challenging territories where optical or acoustic windows are limited. Photoacoustic catheters, a nascent segment at 12 %, combine optical excitation with ultrasonic detection to reveal molecular signatures, attracting interest in oncology and inflammatory disease imaging. Hybrid multimodal catheters, comprising the remaining 8 %, integrate two or more modalities (e.g., IVUS‑OCT or OCT‑photoacoustic) to deliver complementary information, supporting precision interventions. This typology underpins the overall market composition and guides R&D allocation within the Imaging Diagnostic Catheters segmentation framework.