Phase A/B clean review v2

Scope: STEP-derived receive surrogate, unloaded ideal-decoupled layout surrogate, Psi=I. Phase A is receive-coverage surrogate, not true SNR. Phase B is PPA/1-g-like encoding efficiency surrogate, not measured g-factor.
Display: Twin-breast tissue ROI for scaling/metrics, medial gap excluded, all STEP loop projections overlaid, axis labels stated in image titles.

Contract

{
  "ok": true,
  "candidate_name": "phase_ab_clean_review_v2_current",
  "workers_used": 3,
  "source_candidate": "/home/daniel/coil_compare/data/output/tool_checks/ppa_surrogate_v1_phase_ab_20260506_142330",
  "image_count": 6,
  "npz_count": 32,
  "records_expected": 32,
  "records_loaded": 32,
  "qa_flag_count": 0,
  "fatal_qa_flag_count": 0,
  "phase_a_name": "receive-coverage surrogate",
  "phase_a_not_true_snr": true,
  "phase_b_name": "PPA/1-g-like encoding efficiency surrogate",
  "combined_proxy_name": "coverage \u00d7 1/g-like proxy",
  "main_display_roi": "twin-breast tissue ROI for scaling and metrics; medial gap excluded",
  "loop_overlay_setup_ok_count": 4,
  "source_contract_main_roi_count": 0,
  "source_contract_alias_mask_count": 16,
  "maps_visually_reviewable_decision": "yes for technical visual review",
  "next_step": "After visual review, build alias-partner explainability panels for Phase B if PPA bands remain suspicious."
}

b0_y_transverse_xz_phase_a_receive_coverage_surrogate.png

b0_y_transverse_xz_phase_b_1overg_like_encoding_efficiency.png

b0_y_transverse_xz_phase_b_snrg_like_proxy.png

b0_z_transverse_xy_phase_a_receive_coverage_surrogate.png

b0_z_transverse_xy_phase_b_1overg_like_encoding_efficiency.png

b0_z_transverse_xy_phase_b_snrg_like_proxy.png

Tables