The Medtronic Market-Released DF4 Lead Imaging Study is a prospective, non-randomized study, multi-center clinical investigation.

The purpose of this clinical investigation is to collect high quality medical images of the Medtronic Market-Released DF4 lead in the shoulder and heart. Images collected during the study will allow for lead design and testing processes better tailored to the implanted environment.

Inclusion Criteria:

• Patients greater than 18 years of age.
• Patients able and willing to attend imaging session.
• Patients able and willing to give informed consent.
• Patients with an implanted device/lead(s) for a minimum of 3 months.

Exclusion Criteria:

• Subjects who require a legally authorized representative to obtain consent.
• Subjects with exclusion criteria required by local law (e.g. age, breastfeeding
• Pregnant women, or women of child bearing potential and who are not on a reliable form of birth control.

Patients followed at participating centers.