JP2013031633A5 - - Google Patents
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- JP2013031633A5 JP2013031633A5 JP2012070773A JP2012070773A JP2013031633A5 JP 2013031633 A5 JP2013031633 A5 JP 2013031633A5 JP 2012070773 A JP2012070773 A JP 2012070773A JP 2012070773 A JP2012070773 A JP 2012070773A JP 2013031633 A5 JP2013031633 A5 JP 2013031633A5
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- JP
- Japan
- Prior art keywords
- sar
- magnetic resonance
- imaging apparatus
- resonance imaging
- pulse
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- 238000002595 magnetic resonance imaging Methods 0.000 claims 16
- 238000010521 absorption reaction Methods 0.000 claims 14
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims 6
- 230000037396 body weight Effects 0.000 claims 3
- 238000009529 body temperature measurement Methods 0.000 claims 2
- 238000003384 imaging method Methods 0.000 claims 2
- 230000003068 static Effects 0.000 claims 2
- 238000007689 inspection Methods 0.000 claims 1
- 230000001678 irradiating Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 230000001702 transmitter Effects 0.000 claims 1
Claims (9)
前記ＲＦパルスの照射を含む所定のパルスシーケンスを用いた撮像を制御する撮像制御部と、
前記ＲＦパルスによって、被検体に吸収されるＳＡＲ値を求めるＳＡＲ計算部と、
前記ＳＡＲ値が所定の制限値を超えるか否かを監視するＳＡＲ監視部と、
を備えた磁気共鳴イメージング装置であって、
前記ＳＡＲ計算部は、前記被検体毎に、
前記被検体のＲＦ吸収量を求め、
該ＲＦ吸収量に基づいて前記所定のパルスシーケンスのＳＡＲ値を求める
ことを特徴とする磁気共鳴イメージング装置。 A transmitter for irradiating an RF pulse to a subject placed in a static magnetic field;
An imaging control unit that controls imaging using a predetermined pulse sequence including irradiation of the RF pulse;
A SAR calculation unit for obtaining a SAR value absorbed by the subject by the RF pulse;
A SAR monitoring unit that monitors whether the SAR value exceeds a predetermined limit value;
A magnetic resonance imaging apparatus comprising:
The SAR calculator is provided for each subject.
Determining the amount of RF absorption of the subject;
A magnetic resonance imaging apparatus, wherein an SAR value of the predetermined pulse sequence is obtained based on the RF absorption amount.
前記被検体に複数の検査が行われる場合に、
前記ＳＡＲ計算部は、前記検査毎に、
前記被検体のＲＦ吸収量を求め、
該ＲＦ吸収量に基づいて、前記所定のパルスシーケンスのＳＡＲ値を求める
ことを特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to claim 1.
When a plurality of examinations are performed on the subject,
The SAR calculation unit, for each inspection,
Determining the amount of RF absorption of the subject;
A magnetic resonance imaging apparatus, wherein an SAR value of the predetermined pulse sequence is obtained based on the RF absorption amount.
前記ＳＡＲ計算部は、基準ＲＦパルスのＲＦ吸収量を求め、該基準ＲＦパルスのＲＦ吸収量と、前記被検体の体重と、前記所定のパルスシーケンスを構成するＲＦパルスの組み合わせと、に基づいて、該所定のパルスシーケンスのＳＡＲ値を求めることを特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to claim 1 or 2,
The SAR calculation unit obtains the RF absorption amount of the reference RF pulse, and based on the RF absorption amount of the reference RF pulse, the body weight of the subject, and the combination of the RF pulses constituting the predetermined pulse sequence. A magnetic resonance imaging apparatus characterized by obtaining an SAR value of the predetermined pulse sequence.
前記ＳＡＲ計算部は、基準ＲＦパルスを用いたＳＡＲ計測専用シーケンスに基づいて、前記ＲＦ吸収量を求めることを特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to any one of claims 1 to 3,
The magnetic resonance imaging apparatus, wherein the SAR calculation unit obtains the RF absorption amount based on a SAR measurement dedicated sequence using a reference RF pulse.
前記ＳＡＲ計算部は、基準ＲＦパルスの強度を設定する基準ＲＦパルス強度設定シーケンスに基づいて、前記ＲＦ吸収量を求めることを特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to any one of claims 1 to 3,
The magnetic resonance imaging apparatus, wherein the SAR calculation unit obtains the RF absorption amount based on a reference RF pulse intensity setting sequence for setting an intensity of a reference RF pulse.
前記ＳＡＲ計算部は、前記基準ＲＦパルスの強度とＲＦ吸収量との関係に基づいて、前記基準ＲＦパルスの強度を用いて前記ＲＦ吸収量を求めることを特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to claim 3.
The magnetic resonance imaging apparatus, wherein the SAR calculation unit obtains the RF absorption amount using the intensity of the reference RF pulse based on the relationship between the intensity of the reference RF pulse and the RF absorption amount.
前記ＳＡＲ計算部は、前記被検体の体重と前記ＲＦ吸収量との関係に基づいて、前記被検体の体重を用いて前記ＲＦ吸収量を求めることを特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to claim 3.
The magnetic resonance imaging apparatus, wherein the SAR calculation unit obtains the RF absorption amount using the body weight of the subject based on the relationship between the body weight of the subject and the RF absorption amount.
前記被検体の温度上昇を計測する温度計測部を備え、前記ＳＡＲ計算部は、前記温度計測部により得られた値を用い、前記計算したＳＡＲ値との誤差が大きい場合、ＳＡＲ値を温度計測による値で置き換えることを特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to claim 1,
A temperature measurement unit that measures a temperature rise of the subject, and the SAR calculation unit uses the value obtained by the temperature measurement unit, and when the error from the calculated SAR value is large, the SAR value is measured A magnetic resonance imaging apparatus, wherein the value is replaced with a value obtained by
前記被検体のＲＦ吸収量を求めるステップと、
前記ＲＦ吸収量に基づいて所定のパルスシーケンスのＳＡＲ値を求めるステップと、
前記ＳＡＲ値が所定の制限値を超えるか否かを監視するステップと、を有してなることを特徴とするＳＡＲ予測方法。 A SAR prediction method for predicting a SAR value absorbed by an object placed in a static magnetic field by irradiation of an RF pulse with the object,
Obtaining an RF absorption amount of the subject;
Obtaining a SAR value of a predetermined pulse sequence based on the RF absorption amount;
And a step of monitoring whether or not the SAR value exceeds a predetermined limit value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012070773A JP2013031633A (en) | 2011-06-29 | 2012-03-27 | Magnetic resonance imaging apparatus and method for sar prediction |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011143667 | 2011-06-29 | ||
| JP2011143667 | 2011-06-29 | ||
| JP2012070773A JP2013031633A (en) | 2011-06-29 | 2012-03-27 | Magnetic resonance imaging apparatus and method for sar prediction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2013031633A JP2013031633A (en) | 2013-02-14 |
| JP2013031633A5 true JP2013031633A5 (en) | 2015-04-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012070773A Pending JP2013031633A (en) | 2011-06-29 | 2012-03-27 | Magnetic resonance imaging apparatus and method for sar prediction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2013031633A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104023627A (en) * | 2012-08-29 | 2014-09-03 | 株式会社东芝 | Magnetic resonance imaging device and method for computing specific absorption ratio thereof |
| JP6147026B2 (en) * | 2013-02-27 | 2017-06-14 | 株式会社日立製作所 | Magnetic resonance imaging apparatus and method |
| JP6058451B2 (en) | 2013-03-29 | 2017-01-11 | 東芝メディカルシステムズ株式会社 | Magnetic resonance imaging device |
| DE102013206325A1 (en) * | 2013-04-10 | 2014-10-16 | Siemens Aktiengesellschaft | Magnetic resonance system with group-wise control of transmitting antennas |
| US10441182B2 (en) | 2013-07-12 | 2019-10-15 | Hitachi, Ltd. | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
| JP6334143B2 (en) * | 2013-11-26 | 2018-05-30 | 株式会社日立製作所 | Database generator |
| US9547063B2 (en) * | 2014-02-03 | 2017-01-17 | Toshiba Medical Systems Corporation | Calculating specific absorption rate (SAR) with magnetic resonance signals |
| JP6338877B2 (en) * | 2014-02-12 | 2018-06-06 | キヤノンメディカルシステムズ株式会社 | Magnetic resonance imaging system |
| JP6411063B2 (en) | 2014-05-07 | 2018-10-24 | キヤノンメディカルシステムズ株式会社 | Magnetic resonance imaging apparatus and SAR calculation method |
| JP6325645B2 (en) * | 2016-12-07 | 2018-05-16 | キヤノンメディカルシステムズ株式会社 | Magnetic resonance imaging apparatus, magnetic resonance imaging system, arithmetic unit, and imaging support method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2544613B2 (en) * | 1987-03-11 | 1996-10-16 | 昭和アルミニウム株式会社 | Bundling device for heat exchanger assembly |
| JP2001190516A (en) * | 2000-01-06 | 2001-07-17 | Shimadzu Corp | Nuclear magnetic resonance inspection device |
| JP2002186595A (en) * | 2000-12-22 | 2002-07-02 | Toshiba Corp | Magnetic resonance diagnosing apparatus and storage medium |
| JP4820601B2 (en) * | 2004-08-30 | 2011-11-24 | 株式会社東芝 | Magnetic resonance diagnostic equipment |
| JP5666470B2 (en) * | 2009-11-27 | 2015-02-12 | 株式会社日立メディコ | Nuclear magnetic resonance imaging apparatus and SAR estimation method |
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- 2012-03-27 JP JP2012070773A patent/JP2013031633A/en active Pending
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