diff --git a/app/src/main/java/com/example/medilightv2android/ui/views/clinical/ClinicalLiveView.kt b/app/src/main/java/com/example/medilightv2android/ui/views/clinical/ClinicalLiveView.kt
index dc3d2a0..7061a40 100644
--- a/app/src/main/java/com/example/medilightv2android/ui/views/clinical/ClinicalLiveView.kt
+++ b/app/src/main/java/com/example/medilightv2android/ui/views/clinical/ClinicalLiveView.kt
@@ -78,10 +78,38 @@ fun ClinicalLiveView(appState: AppState) {
     // 한 사이클 = piezo 완료 + imu 완료. piezo가 먼저 오면 buffer에 보관, imu 도착 시 합쳐 push.
     var pendingPiezo by remember { mutableStateOf<List<PiezoChannelData>?>(null) }
 
+    // V4.1 wall detection — 채널별 ant/post peak 표시용 (사내 테스트 가시화 요청)
+    val v41 = remember { com.example.medilightv2android.walldetect.V41Detector() }
+    var channelWalls by remember { mutableStateOf<List<Pair<Int, Int>?>>(List(6) { null }) }
+
     DisposableEffect(Unit) {
         bleManager.piezoCollector.onMultiChannelComplete = { channels ->
             lastChannels = channels
             pendingPiezo = channels
+            // V4.1로 채널별 ant/post 즉시 계산 (실패해도 측정 자체는 영향 없음)
+            runCatching {
+                val adcMatrix = (0 until 6).map { ch ->
+                    channels.find { it.channel == ch }?.buffer?.map { it.toInt() } ?: List(100) { 0 }
+                }
+                val probe = com.example.medilightv2android.walldetect.dto.ProbeProfileDto(
+                    name = com.example.medilightv2android.managers.PiezoHW.presetName,
+                    rMm = 50.2, anteriorAnchorMm = 32.0,
+                    fsHz = 537500, cMmPerUs = 1.54,
+                    anglesDeg = com.example.medilightv2android.managers.PiezoHW.degreeAll.toList()
+                )
+                val sweepInput = com.example.medilightv2android.walldetect.dto.SweepInput(
+                    requestId = "clinical_${System.currentTimeMillis()}",
+                    timestampMs = System.currentTimeMillis(),
+                    deviceId = bleManager.connectedDeviceName.value,
+                    sweepSeq = 0, probe = probe, adc = adcMatrix
+                )
+                val result = v41.detect(sweepInput)
+                channelWalls = List(6) { ch ->
+                    val r = result.perChannel.firstOrNull { it.ch == ch }
+                    val a = r?.antIdx; val p = r?.postIdx
+                    if (a != null && p != null) Pair(a, p) else null
+                }
+            }
         }
         bleManager.imuCollector.onComplete = { imuSamples ->
             lastImu = imuSamples
@@ -147,6 +175,7 @@ fun ClinicalLiveView(appState: AppState) {
         // ── 6ch grid (2 rows × 3 cols) ──
         SixChannelGrid(
             channels = lastChannels,
+            walls = channelWalls,
             modifier = Modifier.fillMaxWidth().padding(horizontal = 8.dp)
         )
 
@@ -272,6 +301,7 @@ fun ClinicalLiveView(appState: AppState) {
 @Composable
 private fun SixChannelGrid(
     channels: List<PiezoChannelData>,
+    walls: List<Pair<Int, Int>?>,
     modifier: Modifier = Modifier
 ) {
     val channelColors = listOf(
@@ -289,6 +319,7 @@ private fun SixChannelGrid(
                             channelIdx = ch,
                             buffer = data?.buffer ?: emptyList(),
                             color = channelColors[ch],
+                            walls = walls.getOrNull(ch),
                         )
                     }
                 }
@@ -297,13 +328,16 @@ private fun SixChannelGrid(
     }
 }
 
-/** 한 채널 그래프 (raw ADC waveform) */
+/** 한 채널 그래프 (raw ADC waveform + V4.1 ant/post 마커) */
 @Composable
 private fun ChannelChart(
     channelIdx: Int,
     buffer: List<UShort>,
     color: Color,
+    walls: Pair<Int, Int>?,
 ) {
+    val antColor = Color(0xFF4CAF50)   // green = anterior wall
+    val postColor = Color(0xFFFF9800)  // orange = posterior wall
     Card(
         shape = RoundedCornerShape(6.dp),
         colors = CardDefaults.cardColors(containerColor = Color.White),
@@ -320,6 +354,12 @@ private fun ChannelChart(
                 Spacer(modifier = Modifier.width(4.dp))
                 Text("CH$channelIdx", fontSize = 10.sp, fontWeight = FontWeight.Bold)
                 Spacer(modifier = Modifier.weight(1f))
+                if (walls != null) {
+                    Text("a${walls.first}", fontSize = 9.sp, color = antColor, fontWeight = FontWeight.SemiBold)
+                    Spacer(modifier = Modifier.width(3.dp))
+                    Text("p${walls.second}", fontSize = 9.sp, color = postColor, fontWeight = FontWeight.SemiBold)
+                    Spacer(modifier = Modifier.width(4.dp))
+                }
                 if (buffer.isNotEmpty()) {
                     val peak = buffer.maxOrNull()?.toInt() ?: 0
                     Text("$peak", fontSize = 9.sp, color = MlSecondaryText)
@@ -348,6 +388,19 @@ private fun ChannelChart(
                     )
                 }
 
+                // V4.1 ant/post 마커 (waveform 뒤에 그려서 가려지지 않게 alpha 조정)
+                if (walls != null) {
+                    val (antIdx, postIdx) = walls
+                    if (antIdx in 0 until n) {
+                        val x = antIdx * xScale
+                        drawLine(antColor.copy(alpha = 0.75f), Offset(x, 0f), Offset(x, h), strokeWidth = 1.5f)
+                    }
+                    if (postIdx in 0 until n) {
+                        val x = postIdx * xScale
+                        drawLine(postColor.copy(alpha = 0.75f), Offset(x, 0f), Offset(x, h), strokeWidth = 1.5f)
+                    }
+                }
+
                 // waveform
                 val path = Path()
                 for (i in buffer.indices) {