Yuav ua li cas kho cov cuab yeej thaum kuaj ultrasound (nrog cov lus piav qhia ib kauj ruam- Ntu 2)

2. CDFI

· Siv CDFI: Tshawb xyuas cov hlab ntsha, txheeb xyuas qhov xwm txheej ntawm cov kav dej,

Txheeb xyuas cov hlab ntsha thiab cov hlab ntsha, qhia keeb kwm thiab kev coj ntawm cov ntshav khiav,

Lub sij hawm theem, qhia txog qhov xwm ntawm cov ntshav khiav, qhia cov ntshav khiav ceev ceev

Slow, coj spectral Doppler sampling txoj hauj lwm

1) CDFI cov ntsiab lus hloov kho tsis tu ncua (cov ntawv liab):

2) CDFI tsis tshua hloov cov ntsiab lus

Tag nrho qhov nce:

 

Xim lub thawv loj thiab txoj haujlwm

Duab sib txawv ntawm siab dhau, qis dhau thiab nruab nrab Scale

Xim sampling ncej deflection lub kaum sab xis steer

Deflect raws li kev coj ntawm cov hlab ntsha kom cov ntshav ntws hauv cov kab noj hniav tag nrho thiab txaus siab.

Nqe Lus Nug 1: Yuav ua li cas kho cov kev ntsuas ultrasound kom pom cov ntshav qis qis?

1. Nce --- nce

2. Txo --- ceev scale SCALE

3. Ntxiv --- suab tso zis tso zis zog

4. Ntxiv --- ncej nruab nrab

6. Txo---sampling cheeb tsam

6. Txo --- tus naj npawb ntawm cov ntsiab lus tsom (optimize focus)

7. Txo --- nrug

Txo--sampling cheeb tsam qhia:

Nqe Lus Nug 2: Yuav ua li cas txo cov ntshav los ntshav thiab tshem tawm aliasing?

1. Txo--tau txais

2. Ntxiv--ceev scale SCALE

Nqe Lus Nug 3: Yuav ua li cas nce tus ncej?

1. Txo --- B hom loj

2. Txo --- qhov tob

3. Txo --- xim xim thav duab

4. Txo --- ncej nruab nrab

5. Txo --- tus naj npawb ntawm cov ntsiab lus tsom

6. Txo --- nrhiav kom pom deb

3. Spectral Doppler hloov txoj kev

1. Txoj kev ua haujlwm: Yog tias tus nqi ntws tsis siab, xaiv PW, yog tias tus nqi ntws siab, xaiv CW.

2. Lim tej yam kev mob: Low-pass filtering yog siv rau low-speed blood flow, thiab high-pass filtering yog siv rau high-ceev cov ntshav khiav.

3. Kev ntsuas ceev: Xaiv qhov ntsuas ntsuas nrawm raws li ntsuas cov ntshav khiav ceev.

4. Sampling qhov rooj: kuaj cov hlab ntsha, qhov rooj piv txwv ≤ cov hlab ntsha sab hauv txoj kab uas hla.Tshawb xyuas intracardiac li qub

Lub qhov ncauj qhov rooj yog qhov nruab nrab.

5. Zero lub hauv paus: txav lub hauv paus tuaj yeem ua rau qhov ntsuas qhov ntau hauv ib qho kev taw qhia thiab tsis txhob ua yuam kev.

Tam sim no aliased.

6. zaus hloov lub teeb liab tig nce thiab nqis: yooj yim rau kev ntsuas, qhov ntsuas tau cia li ntim cov spectrum waveform.

7. Lub kaum sab xis: kev kuaj mob plawv ≤ 20, cov hlab ntsha peripheral ≤ 60, thiab lub kaum sab xis yuav tsum kho.

8. Kev sib kis ntau zaus: Lub zaus ntau dua yog siv rau cov ntshav qis qis, thiab qis dua yog siv rau cov ntshav khiav ceev.

PW feem ntau kho cov ntsiab lus

Thaum PW nce loj heev

Thaum qhov ntau yog nruab nrab, qis dhau lossis siab dhau

Sampling qhov rooj loj

1. Thaum lub qhov rooj sampling nqaim, tsis tshua muaj qhov sib txawv ntawm qhov ntws tawm ntawm cov khaubncaws sab nraud povtseg, qhov "vt" nkhaus yog nqaim, thiab lub qhov rais loj.

2. Thaum lub qhov rooj piv txwv npog tag nrho cov lumen, lub qhov rais "ua tiav"

kev hloov pauv hauv paus siab dhau los lossisib yam nkausqis:

Nqe Lus Nug 5: Yuav Ua Li Cas Ntxiv PW & CW rhiab heev

1. Nce nce

2. Ua kom lub suab tso zis ntau ntxiv

3. Ua kom cov qauv ntim ntau ntxiv

4. Teem lub kaum sab xis scan kom tsim nyog

Nco tseg: Ultrasound instruments muaj preset tej yam kev mob thiab yog tsim nyog rau kev soj ntsuam cov kab mob sib txawv thiab cov ntaub so ntswg.

Raws li qhov preset settings, ua kom haum raws li cov kev mob tshwj xeeb kom tau raws li qhov xav tau kev kuaj mob.