The Development of a Dual-Radar System with Automatic Hypopnea Threshold Optimization for Contact-Free Sleep Apnea-Hypopnea Syndrome Screening
Table 1
Number of radar detected hypopnea events.
Participant
AHI by PSG
Average amplitude (degree)
Number of radar detected events corresponding to K value
Before optimizing
Radar1
Radar2
1
8.3
5.8
4.8
4
17
48
65
75
92
108
161
2
12.0
7.9
7.1
25
46
62
74
76
80
83
102
3
14.0
6.3
5.6
22
56
80
100
120
137
155
246
4
15.6
4.5
4.9
10
43
65
85
106
121
129
144
5
15.6
4.2
2.5
24
62
99
122
138
156
167
211
6
19.2
3.3
5.3
16
49
82
107
124
145
149
174
7
20.0
8.2
5.9
23
62
90
118
131
163
172
191
8
20.2
2.9
2.4
6
29
71
112
141
152
161
173
9
21.8
4.8
4.8
26
69
95
111
136
163
189
259
10
26.0
4.8
2.7
21
57
79
90
104
118
122
160
11
26.0
3.3
3.8
7
60
105
159
198
240
260
358
12
28.5
4.7
3.8
21
61
88
114
140
160
170
184
13
29.2
3.5
3.5
49
105
142
160
182
192
204
236
14
29.9
3.0
2.5
6
55
105
137
158
175
189
194
15
37.7
7.0
6.7
60
126
169
199
233
264
285
301
16
39.2
7.5
6.2
76
257
399
501
567
612
651
744
17
39.6
16.2
19.1
54
152
235
320
383
421
460
466
18
39.6
10.9
12.9
113
296
424
512
575
619
663
673
19
43.2
7.9
3.9
14
57
114
162
190
207
221
276
20
47.6
5.0
11.7
63
173
268
335
377
431
455
497
21
59.5
6.3
5.9
28
85
162
234
284
321
349
398
22
59.5
5.1
8.3
56
148
221
269
308
333
350
386
23
64.0
3.9
4.0
65
197
314
358
381
389
405
414
24
67.5
12.4
17.5
94
220
313
416
500
555
615
584
25
68.1
9.0
11.6
33
117
161
189
213
233
244
212
26
71.4
13.0
9.7
178
402
562
687
761
828
878
936
27
99.2
12.1
11.0
136
266
368
456
503
537
559
595
Column 2: individual apnea-hypopnea index obtained via PSG. Columns 3 and 4: the average radar-detected respiration amplitude. Columns 5 to 11: number of radar-detected events corresponding to K value. Column 12: radar detected events before automatic normal-hypopnea threshold optimization.
