A Novel MR Agent for Tumor Angiogenesis Evaluation Tumor Contrast Depends on the conformation of the agent Rat #1 with Tumor Rat #2 with Tumor Linear polymer, 0.025 mmol Gd/kg Linear Polymer, 0.025 mmol Gd/kg Contrast Agents 2. Semi-extendad 3. semi-coiled 6. Gd-DTPA Coiled Polymer, 0.025 mmol Gd/kg Contrast Agent Type Rat Mammary Adenocarcinoma in Female Fisher Rats 24 hours After Agent Injection Genomics and Molecular imaG e n o m i c s a n d M o l e c u l a r I m a g i n g Rat Mammary Adenocarcinoma in Female Fisher Rats 24 hours After Agent Injection Rat #1 with Tumor Linear polymer, 0.025 mmol Gd/kg Rat #2 with Tumor Linear Polymer, 0.025 mmol Gd/kg Control Coiled Polymer, 0.025 mmol Gd/kg Tumor Contrast Depends on the Conformation of the Agent A Novel MR Agent for Tumor Angiogenesis Evaluation