JPH0375702U - - Google Patents
Info
- Publication number
- JPH0375702U JPH0375702U JP13646889U JP13646889U JPH0375702U JP H0375702 U JPH0375702 U JP H0375702U JP 13646889 U JP13646889 U JP 13646889U JP 13646889 U JP13646889 U JP 13646889U JP H0375702 U JPH0375702 U JP H0375702U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- gain
- magnitude
- converter
- gain amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003384 imaging method Methods 0.000 claims 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Description
第１図は本考案の一実施例の要部構成ブロツク
図、第２図は決定されたゲイン情報と可変ゲイン
増幅器のゲインと重み付けの量の関係を示す図、
第３図は受信アナログ信号入力に対するＡＤ変換
器出力の関係を示す図、第４図は各回路動作のタ
イムチヤートである。
１…プリアンプ、２…検波器、３…可変ゲイン
増幅器、４…帰還回路、５…ＬＰＦ、６…Ｓ／Ｈ
、７…ＡＤ変換器、８…タイミング回路、９…Ｃ
ＰＵ、１０…画像処理回路。
FIG. 1 is a block diagram of the main part of an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the determined gain information, the gain of the variable gain amplifier, and the amount of weighting.
FIG. 3 is a diagram showing the relationship between the AD converter output and the received analog signal input, and FIG. 4 is a time chart of each circuit operation. 1...Preamplifier, 2...Detector, 3...Variable gain amplifier, 4...Feedback circuit, 5...LPF, 6...S/H
, 7...AD converter, 8...timing circuit, 9...C
PU, 10...image processing circuit.
Claims (1)
周波信号に変換する検波器２と、 該検波器２の出力信号を信号入力の大きさに応
じてゲインを変更する可変ゲイン増幅器３と、 該可変ゲイン増幅器３の出力電圧を測定してそ
の大きさに応じて前記可変ゲイン増幅器３のゲイ
ンを変更させると共に、デイジタル信号のゲイン
情報を出力する帰還回路４と、 入力信号をサンプリングホールドするＳ／Ｈ６
と、 ゲインの変更によつて入力受信信号の大きさに
拘わらず略同等の大きさに増幅された信号を上位
ビツドのデイジタル信号に変換するＡＤ変換器７
と、 前記帰還回路４からのゲイン情報に基づき、前
記ＡＤ変換器７の出力信号に可変ゲイン増幅器３
で行つた増幅の倍率に逆比例する重み付けを行つ
て信号を復元するＣＰＵ９と、 前記帰還回路４と前記Ｓ／Ｈ６と前記ＡＤ変換
器７とに動作のタイミングを規制する規制信号を
供給するタイミング回路８とを具備することを特
徴とするＭＲイメージング装置。[Claims for Utility Model Registration] A detector 2 that detects a received signal of an MR imaging device and converts it into a low frequency signal, and a variable device that changes the gain of the output signal of the detector 2 according to the magnitude of the signal input. a gain amplifier 3; a feedback circuit 4 that measures the output voltage of the variable gain amplifier 3 and changes the gain of the variable gain amplifier 3 according to the magnitude thereof, and outputs gain information of a digital signal; and an input signal. S/H6 to sample and hold
and an AD converter 7 which converts the signal amplified to a substantially same magnitude regardless of the magnitude of the input received signal by changing the gain into an upper bit digital signal.
Based on the gain information from the feedback circuit 4, a variable gain amplifier 3 is applied to the output signal of the AD converter 7.
a CPU 9 that restores the signal by performing weighting that is inversely proportional to the amplification factor performed in the above, and a timing for supplying a regulation signal that regulates the timing of operation to the feedback circuit 4, the S/H 6, and the AD converter 7. An MR imaging apparatus comprising a circuit 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13646889U JPH0375702U (en) | 1989-11-24 | 1989-11-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13646889U JPH0375702U (en) | 1989-11-24 | 1989-11-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0375702U true JPH0375702U (en) | 1991-07-30 |
Family
ID=31683671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13646889U Pending JPH0375702U (en) | 1989-11-24 | 1989-11-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0375702U (en) |
-
1989
- 1989-11-24 JP JP13646889U patent/JPH0375702U/ja active Pending
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