291:
234:
139:
MI is a unitless number that can be used as an index of cavitation bio-effects; a higher MI value indicates greater exposure. Levels below 0.3 are generally considered to have no detectable effects. Currently the
82:
130:
MI is measured with a calibrated hydrophone in a tank of degassed water. The pulse pressure amplitudes are measured along the central axis of the ultrasound beam. The P
332:
275:
200:
169:
366:
33:
376:
325:
268:
141:
318:
371:
361:
261:
356:
351:
196:
165:
302:
245:
188:
117:
215:
298:
144:
stipulates that diagnostic ultrasound scanners cannot exceed a mechanical index of 1.9.
290:
345:
136:
is calculated by reducing it using an attenuation coefficient of 0.3 dB/cm/MHz.
104:
107:), derated by an attenuation factor to account for in-tissue acoustic attenuation
24:
241:
192:
100:
233:
182:
162:
Diagnostic
Ultrasound Imaging: Inside Out (Biomedical Engineering)
121:
77:{\displaystyle {\text{MI}}={\frac {P_{r}}{\sqrt {f_{c}}}},}
216:
http://www.accessdata.fda.gov/cdrh_docs/pdf9/K091970.pdf
306:
249:
36:
76:
326:
269:
8:
333:
319:
276:
262:
62:
51:
45:
37:
35:
153:
7:
287:
285:
230:
228:
184:Fundamentals of Medical Ultrasonics
305:. You can help Knowledge (XXG) by
248:. You can help Knowledge (XXG) by
14:
289:
232:
1:
393:
284:
227:
27:metric. It is defined as
120:of the ultrasound pulse (
297:This article related to
103:of the ultrasound wave (
99:is the peak rarefaction
367:Medical ultrasonography
244:-related article is a
78:
377:Medical imaging stubs
193:10.1201/9781482266641
187:. London: CRC Press.
160:Thomas Szabo (2004).
79:
218:(accessed July 2010)
34:
181:Postema M (2011).
74:
314:
313:
257:
256:
202:978-0-203-86350-3
170:978-0-12-680145-3
69:
68:
40:
384:
335:
328:
321:
293:
286:
278:
271:
264:
236:
229:
219:
213:
207:
206:
178:
172:
158:
118:center frequency
83:
81:
80:
75:
70:
67:
66:
57:
56:
55:
46:
41:
38:
23:) is a unitless
17:Mechanical index
392:
391:
387:
386:
385:
383:
382:
381:
372:Acoustics stubs
362:Medical physics
342:
341:
340:
339:
299:medical imaging
283:
282:
225:
223:
222:
214:
210:
203:
180:
179:
175:
159:
155:
150:
134:
114:
97:
58:
47:
32:
31:
12:
11:
5:
390:
388:
380:
379:
374:
369:
364:
359:
354:
344:
343:
338:
337:
330:
323:
315:
312:
311:
294:
281:
280:
273:
266:
258:
255:
254:
237:
221:
220:
208:
201:
173:
152:
151:
149:
146:
132:
128:
127:
126:
125:
112:
108:
95:
85:
84:
73:
65:
61:
54:
50:
44:
13:
10:
9:
6:
4:
3:
2:
389:
378:
375:
373:
370:
368:
365:
363:
360:
358:
355:
353:
350:
349:
347:
336:
331:
329:
324:
322:
317:
316:
310:
308:
304:
300:
295:
292:
288:
279:
274:
272:
267:
265:
260:
259:
253:
251:
247:
243:
238:
235:
231:
226:
217:
212:
209:
204:
198:
194:
190:
186:
185:
177:
174:
171:
167:
163:
157:
154:
147:
145:
143:
137:
135:
123:
119:
115:
109:
106:
102:
98:
92:
91:
90:
89:
88:
71:
63:
59:
52:
48:
42:
30:
29:
28:
26:
22:
18:
307:expanding it
296:
250:expanding it
239:
224:
211:
183:
176:
161:
156:
138:
131:
129:
110:
94:
86:
20:
16:
15:
357:Ultrasound
346:Categories
148:References
25:ultrasound
352:Acoustics
242:acoustics
101:pressure
116:is the
199:
168:
87:where
301:is a
240:This
303:stub
246:stub
197:ISBN
166:ISBN
189:doi
142:FDA
122:MHz
105:MPa
348::
195:.
164:.
124:).
39:MI
21:MI
334:e
327:t
320:v
309:.
277:e
270:t
263:v
252:.
205:.
191::
133:r
113:c
111:f
96:r
93:P
72:,
64:c
60:f
53:r
49:P
43:=
19:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
