Add clamping for MTsat parameters

Author: spinicist

Source/MT/MTSatModel.cpp

@@ -9,11 +9,16 @@ auto MTSatModel::fit(QI_ARRAYN(DataType, NI) const &     in,
     auto        B1   = fixed[0];
     auto const &s    = sequence;
 
-    auto R1 = (B1 * B1 / 2.) * (S_t1 * s.al_t1 / s.TR_t1 - S_pd * s.al_pd / s.TR_pd) /
-              (S_pd / s.al_pd - S_t1 / s.al_t1);
-    auto A = (S_pd * S_t1 / B1) * (s.TR_pd * s.al_t1 / s.al_pd - s.TR_t1 * s.al_pd / s.al_t1) /
-             (S_t1 * s.TR_pd * s.al_t1 - S_pd * s.TR_t1 * s.al_pd);
-    auto d           = (A * s.al_mt / S_mt - 1.0) * R1 * s.TR_mt - s.al_mt * s.al_mt / 2;
-    auto d_corrected = d * (1.0 - C) / (1.0 - C * B1);
+    auto const R1 =
+        std::clamp((B1 * B1 / 2.) * (S_t1 * s.al_t1 / s.TR_t1 - S_pd * s.al_pd / s.TR_pd) /
+                       (S_pd / s.al_pd - S_t1 / s.al_t1),
+                   0.,
+                   10.);
+    auto const A =
+        std::max((S_pd * S_t1 / B1) * (s.TR_pd * s.al_t1 / s.al_pd - s.TR_t1 * s.al_pd / s.al_t1) /
+                     (S_t1 * s.TR_pd * s.al_t1 - S_pd * s.TR_t1 * s.al_pd),
+                 0.);
+    auto const d           = (A * s.al_mt / S_mt - 1.0) * R1 * s.TR_mt - s.al_mt * s.al_mt / 2;
+    auto const d_corrected = std::clamp(d * (1.0 - C) / (1.0 - C * B1), 0., 0.1);
     return {A, R1, d_corrected * 100};
 }