Role of MRI in Detection of Breast Cancer Molecular Subtypes in Correlation With Immunohistochemistry Results

2.4.4 -Study tools (in detail, e.g., lab methods, instruments, steps, chemicals, ...): Patient with breast cancer (malignant breast mass) will do MRI breast and molecular subtypes will be assessed

MRI imaging studies will performed on a 1.5 T scanner , The patient is placed in the prone position with both breasts placed adequately in a double breast coil (four-channel phased array coil), MRI sequences are:

1. Axial T1WI. 2. Axial T2WI. 3. Axial STIR. 4. DCE-MRI with post-processing subtraction images 5- Axial DWI at b value( 0, 400, 800 and 1000 mm^2 per second) and ADC map will performed 6. MRI spectroscopy MRI acquisition protocol MRI protocols includes

• Axial T2-weighted fast spin echo sequence: TR=3840 ms, TE=81 ms, slice thickness=3.5 mm, and matrix=448×448.
• Coronal T2-weighted fast spin echo sequence: TR=3840 ms, TE=81 ms, slice thickness=3.5 mm, and matrix=448×448.s
• Short tau inversion recovery - axial: TR=8540 ms, TE=59 ms, TI=170 ms, slice thickness=3.5 mm, and matrix=320×314.4.
• The standard dynamic protocol commenced with a coronal three-dimensional rapid Field echo (thrive) sense non-enhanced T1-weighted sequence.
• A gadolinium containing contrast was administered at a dose of 0.2 ml/ kg by power injection at a speed of 2.0 ml/s and flushed with 20 ml of saline solution at the same rate.
• Dynamic imaging was then done in five consecutive series at 90-s intervals. Standard subtraction images were obtained by subtracting precontract images from the early peak postcontrast image.