X-rays, MRIs, CAT scans, Intravenous Pyelogram (IVP), ultrasound, mammograms, etc. do NOT affect breastfeeding or breastmilk.
Radiocontrast (contrast) dyes used to aid the imaging do NOT require that mom interrupt breastfeeding.

Sometimes radiocontrast dyes are used to aid the imaging – these dyes do not require that mom interrupt breastfeeding.