Evaluation of Half-Dose Molecular Breast Imaging With Wide Beam Reconstruction Processing

Inclusion Criteria:

Subgroup 1, Patients with breast lesions:

-At least one breast lesion detected by mammogram, ultrasound or breast MRI that measures < 20 mm in greatest dimension, presents as a mass, is considered suspicious or highly suggestive of malignancy according to the Breast Imaging Reporting and Data System Atlas criteria (BIRADS 4 or 5), and is scheduled for core-needle biopsy or surgical biopsy.

OR

-At least one breast lesion that measures between > 10 mm but < 20 mm in greatest dimension, presents as a mass, is biopsy-proven as malignant, and is scheduled for surgical resection.

AND

Age > 40 years
Negative pregnancy test, postmenopausal, or surgically sterilized

Subgroup 2, Patients without known breast lesions:

Negative screening mammogram performed at Mayo Clinic Rochester within 15 months prior to performance of study MBI
No signs or symptoms of breast disease
Age > 40 years
Negative pregnancy test, postmenopausal, or surgically sterilized

Exclusion Criteria:

Vacuum-assisted or excisional biopsy has been performed prior to the study MBI. Reason: these types of biopsies are more likely to remove all of the tumor
MBI is performed after biopsy and neo-adjuvant chemotherapy is planned prior to surgery. Reason: true tumor size will not be able to be ascertained from the final pathology findings
Breast implants. Reason: cases with breast implants will be easily identifiable on blinded interpretation to take place at the study end
Suspected that breasts will not fit in the MBI field of view. Reason: cases that require tiled views or additional views will be easily identifiable on blinded interpretation to take place at the study end
Only one breast remaining. Reason: unilateral cases will be easily identifiable on blinded interpretation to take place at the study end; injection timing is designed for bilateral views
Pregnancy test (if necessary) is not negative, or the patient is unable to complete the pregnancy test
Physically unable to sit upright and still remain still during two consecutive MBI studies over the course of a 2-hour period.