Table 2.

Summary of image quality scores

Sequence description	Standard resolution		High resolution		Bilateral
Field strength (T)	3	7	3	7	7
Number of subjects	17		16		5
Image quality (reader 1)	4.0±0.6	4.3±0.9	3.3±0.7	4.2±0.7	4.4±0.5
P value	0.27		0.0001
Image quality (reader 2)	4.1±0.6	4.2±0.8	2.9±0.8	4.1±0.8	4.4±0.9
P value	0.64		<0.0001
Reader agreement (kappa value)	0.47	0.67	0.45	0.87	*

The scoring system is defined as: 1) non-diagnostic quality; little certainty in discerning fat and fibroglandular tissue due to strong artefacts including poor SNR or ineffective fat suppression. 2) poor image quality; difficult to make a diagnosis due to primarily indistinct borders between foci of fat and fibroglandular tissue. 3) acceptable image quality; able to make a diagnosis in a majority of the breast volume, though minor artefacts resulted in indistinct borders between foci of fat and fibroglandular tissue in some regions. 4) very good image quality; subjective certainty in making a correct assessment due to distinct borders between foci of fat and fibroglandular tissue and visualization of the underlying trabecular pattern. 5) excellent image quality; no artefacts, very easy to discern fat and fibroglandular tissue in the entire breast volume. The trabecular pattern along with cooper ligaments, milk ducts, and blood vessels were visualized.

^*Not calculated due to small sample size.