CN102038515A - X-ray computed tomography device - Google Patents
X-ray computed tomography device Download PDFInfo
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- CN102038515A CN102038515A CN2011100033711A CN201110003371A CN102038515A CN 102038515 A CN102038515 A CN 102038515A CN 2011100033711 A CN2011100033711 A CN 2011100033711A CN 201110003371 A CN201110003371 A CN 201110003371A CN 102038515 A CN102038515 A CN 102038515A
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Abstract
The invention provides an X-ray computed tomography device. The device has the function of stopping pre-scanning according to the time at which the concentration of the contrast medium in the region of interest (ROI) of the monitored object reaches the predetermined value by pre-scanning the concentration and the function of beginning main scanning. The main scanning conditions are initially set according to the physiological phenomenon which is measured before the contrast medium injection, of the object. Whether the main scanning conditions which are initially set need to be reset is judged according to the variation of the physiological phenomenon measured before finishing pre-scanning. If the main scanning conditions need to be reset through judgment, the main scanning conditions are reset as the main scanning conditions corresponding to the physiological phenomenon measured before finishing pre-scanning from the main scanning conditions which are initially set.
Description
Technical field
The present invention relates to a kind of X ray computer chromatography and hold image device under the arm, this device has to be carried out
Carrying out the merit of prescan before the main scanning forges.
Background technology
In contrast medium (contrast-medium) imaging, be injected into the object that to check
It is very important that contrast medium begins scanning (main scanning) when flowing into the relevant range.Therefore, sweep
Retouching (prescan) carried out before main scanning.In order to suppress x roentgendosis, prescan
Be to carry out by using than the X ray a little less than an ancient spear degree of the X ray that in main scanning, uses. carry
For the data for projection that in prescan, obtains, handle so that carry out real-time reconstruction.Real-time reconstruction
Image (tomographic map) is shown immediately.The image technique personnel are intuitively on the check image
The contrast medium concentrations (dye levels) of relevant range.At the contrast medium of judging relevant zone
When concentration reached fixed in advance concentration, figure gallium technical staff pressed the trigger button of main scanning.
When touching: when a button was pressed, prescan stopped, the preparation of main scanning (setting) beginning.Main
The preparation of scanning comprises couch roll (couch) moved to the sweep limits that thick elder generation determines, will
The volt shafts accelerate to fixed in advance speed, and rotating frame is accelerated to fixed in advance scanning speed,
With filament heating or the like.In case after the preparation of main scanning finished, main scanning began.
Someone has developed the technology that a kind of field by name piece is followed the tracks of (bolus tracking) method,
In this technology, the image technique personnel press and touch: the operation of sending out button is automatic.Follow the tracks of at the field piece
In the method, the CT value of extraction relevant range or average from the image that obtains by prescan
Value, and compare with a threshold value. when the CT of relevant range value or meansigma methods above this threshold value
The time, prescan stops, and the preparation of main scanning begins.
In x ray computer layer anlysing photographing device, by looking for the note ripple to hold synchronously with electrocardiogram
Line scanning the special time phase place obtain one or～the ECG door of series of drawing custom scanning (gated
Scan) scheme is known.According to this scheme, in order to reduce owing to moving of heart produces
The motion anthropic factor, the X ray tube rotation once needed time (scanning speed) and the heart
The moving cycle is compared and will lack enough.
For by the motion anthropic factor being reduced to certain degree, sweep to keep high diagnostic value
The speed of looking for needs enough short, for example, and 500 milliseconds.Realize the condition of 0.2 second scanning speed
Not a duck soup.
Cut with scissors minimizing motion in the popular device as the ratio that at its scanning speed is 1 or 0.5 second
The technology of anthropic factor has been developed a kind of ECG door by name and has been rebuild (exhibition scanning (segment
Scan)) technology.In this section scanning, and obtain skill shadow data and obtain electrocardiogram simultaneously
Number is excerpted.Root connects ECG data, and the projection number from each cardiac cycle is excerpted and concentrated extraction specific
The data (section) of middle part in the period on the cardiac time phase place.From a plurality of cardiac cycles
The multistage that extracts is connected to each other and rebuilds needed 3600 data for projection with prepare image.
In section scanning, the hop count that obtain usually is that thick elder generation is provided with.Along with the time of section is wide
Degree reduces, and the hop count that need obtain increases, and the temporal resolution of image increases.That is, different
Figure gallium quantity in the cardiac time phase place increases. and different therewith is, along with the time width of section
Increase, the hop count that need obtain reduces, and the time branch rate of figure Yu reduces.If the section of obtaining
Number can not reach predetermined quantity, then can not obtain to have fixed in advance temporal resolution
Image.In order to obtain the image with preset time resolution, it is corresponding to need to obtain symbol at least
In the data for projection of heart rate, the hop count that this heart rate is determined corresponding to thick elder generation.
Section scanning is easy to be subjected to the action movement artificial factor. and therefore, this scanning is in disease
When holding the breath, the people carries out.The time span that patient can hold the breath is limited.In section
In the scanning, must in the limited period of holding the breath, obtain needed corresponding to heart rate
Data for projection. therefore, in section scanning, must measure the heart rate of the object that will check in advance,
And must adjust scanning speed according to heart rate, that is, and when the rotation of X ray tube is once needed
Between.
As indicated above, with in the hot-tempered method, prescan was carried out before main scanning at agglomerate.
When sweeping when using quiet sweeping scheme, scanning speed is set constantly and main scanning zero hour to main
Between time difference elongated.Therefore, the heart rate in the main scanning may be with respect to scanning speed is set
Heart rate when spending changes widely.Therefore, in some cases, the scanning speed in the main scanning
The actual heart rate of phase antithetical phrase is unsuitable. this asks that earth becomes more remarkable in the contrast medium inspection.
This is because heart rate is usually because injection of contrast agent and different widely.
Summary of the invention
The objective of the invention is to allow to pass through X at the variation of the physiological phenomenon of the object that will check
The ray computer layer anlysing photographing device is that scan stripes is reset in main scanning with the agglomerate tracking
Part.
Root is drawn together a first aspect of the present invention, provides a kind of x ray computer chromatography to hold the shadow dress under the arm
Put, this device has been injected into contrast by using more weak X ray to carry out thick scanning to obtain
The data of the object of agent, and main by using the X ray that compares an ancient spear to carry out after prescan
Scanning is to obtain the data of object, and this device comprises:
Judging unit, this unit are joined basis by name at start injection contrast medium or prescan and pre-
The number of the physiological phenomenon of the object of amount is excerpted in period between the end of scan, and having judged whether must
Reset the condition of scanning of main scanning, this condition is according to before injection of contrast agent at first
The data of the physiological phenomenon of the object of measuring are provided with; The condition of scanning is provided with the unit, this unit quilt
Join, be changed to when the judgment means judgement is necessary to reset the condition of scanning, main scanning of sweeping
Condition is re-set as corresponding at start injection contrast medium or pre-from the condition of scanning of initial setting
Scanning and thick: the scanning of the data of the physiological phenomenon of the object of measuring in the period between the end of scan
Condition.
According to a second aspect of the invention, provide a kind of X ray computer chromatography to hold the shadow dress under the arm
Put, this device has been injected into contrast by using the X ray that compares another name for Sichuan Province to carry out thick scanning to obtain
The data of the object of agent, and after prescan, carry out main sweeping by using than light strong X ray
Retouch to obtain the data of object, this device comprises one scan condition setting unit, and this unit cane is joined
Being changed to root excerpts at start injection contrast medium or prescan; And measure in the period between prescan finishes
The data of physiological phenomenon of object the finger spare of sweeping of main scanning is set.
Root is hugged a third aspect of the present invention, provides a kind of X ray computer chromatography to hold the shadow dress under the arm
Put, this device is thick by using more weak X ray to carry out: scanning has been injected contrast to obtain cane
The data of the object of agent, and after prescan, carry out main sweeping by using than the X ray of gently catching
Retouch with the number that obtains object and excerpt, this device comprises a display unit, and this unit is configured to right
Between the data of figure and the physiological phenomenon of numerical value display object, and show sweeping of relevant main scanning
Look for the elm of condition to go into the zone;～elm goes into the unit, and this unit is changed to be gone into regional elm elm and go into usefulness
The condition of scanning in main scanning; And one scan condition setting unit, this unit quilt is root each other
According to sweeping that elm in the period between the end that begins to inject contrast medium or prescan and prescan goes into
The condition of retouching is provided with the condition of sweeping of main scanning.
Description of drawings
Of the present invention its some other time mark with advantage will retouching in the back; Illustrated in stating, and partly
From describe, obtain bright fluorine, perhaps can be by practice of the present invention is understood. the present invention
Target and advantage can realize and obtain by the means that hereinafter particularly point out and combination.
The accompanying drawing of included and ingredient that constitute this description in the bright book of this numerous, explanation
Presently preferred embodiment of the present invention, and describe with a drum provided above and below provide
The detailed finger of preferred embodiment state together, be used for setting forth principle of the present invention.
Fig. 1 shows the X ray computer tomographic of Chinese parasol tree according to one embodiment of the present of invention
The block diagram of the structure of the major part of device;
Fig. 2 is that the data in the displayed map 1 are deposited by means of the table of storing in the device (heart rate/Piao distance/scanning
The view of example speed);
Fig. 3 is the flow chart that the agglomerate among this embodiment of demonstration is followed the process of hot-tempered method;
Fig. 4 is the time diagram of the field piece tracking among Fig. 3;
Fig. 5 be supplementary notes among Fig. 3 step earth 56 and 57 wish figure;
Fig. 6 is the view of step 56, S1O and S11 among supplementary notes Fig. 3;
Fig. 7 shows when the main-scan condition of the initial setting among this embodiment is captured to stay to show
The view that shows the example of window;
Fig. 8 shows when the main-scan condition among this embodiment to pick out display window when resetting
The view of example;
Fig. 9 is the process that shows according to the first field piece tracking of revising of this embodiment
Flow chart;
Figure 10 is the process that shows according to the second agglomerate tracking of revising of this embodiment
Flow chart;
Flow chart; And
Figure 12 is the view of the example of the display window during the 3rd of this embodiment of demonstration revises.
The specific embodiment
A plurality of view descriptions X according to a preferred embodiment of the invention below with reference to the accompanying drawings
The ray computer layer anlysing photographing device.Notice that x ray computer chromatography projection arrangement comprises each
Kind of means, for example, the device of rotation/rotation type, in this device, X ray
Pipe and X ray detector are together around the object rotation that will check; The dress of static/rotation type
Put, in this device, many detecting elements are to arrange with the form of ring, and have only X
The object rotation that ray circumference of cannon bone cymbals will be checked.The present invention goes for any type. at this
In the example, will be that example describes with current main flow type one rotation/rotation type one.
In addition, image rebuilding method comprises 3600 methods, and this method requires to want corresponding to centering on
3600 data for projection and half scan method of the one week rotation of the object of checking, this method is wanted
Ask the data for projection of (l800+fan angle).The present invention can be applied in these methods
Any method.In this example, will be that example describes with 3600 methods.
As the mechanism that incident x ray is converted to electric charge, following technology is the main flow skill
Art: the indirect conversion type, this type penetrated X by the fluorescent material such as dodging body
Line is converted to light and by the photo-electric conversion element such as photodiode light is converted to
Lotus; And direct translation type, this type generates electron aperture by X ray in quasiconductor
(electron-hole) to and to move this electron aperture to electrode right, that is, and photoconductive phenomenon.As
X ray detection element can use any scheme in these schemes. in this example, and will
One type in the past, that is, switch through that to hold type under the arm be that example describes.
Recently, along with being installed on rotating ring, many X ray tube and X ray are visited admire
Relevant skill has been developed in the business-like development of so-called multitube type X ray CT device
Art.The present invention can be applied to traditional single tube type X-ray CT device and multitube type
The X ray CT device. in this example, will be that example is advanced with single tube type X-ray CT device
Line description.
In addition, the X ray computer chromatography is held the x X-ray detection X that image device uses the monolithic type under the arm,
This detector has single inspection element arrays, and this array has to be arranged a plurality of along channel direction
X-ray detection device, or the X-ray detector of use multi-disc type, this detector has many
Individual inspection element arrays, these arrays the section direction on and put.The present invention can use this
Any type in a little types.In this example, with former one type, that is, and the monolithic type
X-ray detector is that example describes.
Fig. 1 has shown according to the X ray computer chromatography of this embodiment and has held the main of image device under the arm
The structure of part.Stand 5 encases X-ray tube and X-ray detector. X-ray tube and X
Ray detector is installed in rotation that shape is similar to ring cashier's office in a shop together.The X ray tube is by one
Imaging space is relative with the bun of X X-ray detection X.The object that will check that is positioned on the couch roll 7 is placed on
In the space of becoming social custom of stand 5.Volt tax 7 vertically moves along it.Get on very well in one school, the master of object
Axon is stop 7 the longitudinal axis and the rotating shaft of X-ray tube of parallel sub volt almost.Being parallel to X penetrates
The direction of the rotating shaft of spool is called the sheet direction. and a high voltage generation unit applies tube voltage, and
Provide heater current to generate X ray to X-ray tube.Pass the X village line of elm in phase through object
Generate electric charge in the X ray inspection element of answering.These electric charges are used as current signal and extract.This
Current signal is changeed by data-acquisition system (DAS) holds into voltage signal under the arm.This signal is exaggerated also
Convert digital signal to.This digital signal is compiled as the data for projection and the heart by slip ring and thick processing
The electrograph data are stored in the memorizer together.Image reconstruction unit is heavy based on 3600 data for projection
Foundation numerical)remainder certificate.This image reconstruction unit comprises ECG door reconstruction function. according to the ECG door
Rebuild function, the data (section) in the part period of specific cardiac time phase place are by basis
ECG data is cut off from projected dataset in each cardiac cycle.From a plurality of cardiac cycles
The multistage that cuts off is connected to each other, thereby the set-up dirgram custom is rebuild needed 3600 data for projection.
According to the picture number of ready 3600 data for projection reconstruction corresponding to cardiac time phase place undetermined
To excerpt. the picture number of reconstruction is excerpted and is presented on the display 8 by display controller 10.
The physiological phenomenon of physiological phenomenon amount equipment 4 measuring objects.This physiological phenomenon comprises the heart
Jump (motion of heart), breathe or the like.In this example, physiological phenomenon will be described to＜3
Jump ".Electrocardiography 4 detects the electrical phenomena of heart by the audio-visual education programme that is connected to object, and
Go out this electrical phenomena of expression clear and bright time and the electrocardio that changes admittedly number excerpt. the physiological phenomenon monitor unit
2 are connected to electrocardiograph 4. these physiological phenomenon monitor unit 2 osmanthus according to the ECG data meter
Calculate the heart beating quantity of per minute, i.e. heart rate.Physiology resembles monitor unit 2 also according to calculating
Heart rate is checked the heart rate of current point in time with respect to particular point in time,, main sweeping is set when at first that is
It is true in advance whether the variation of the heart rate of the time point the when heart rate of quoting when retouching condition is measured surpasses
Fixed value.If changes in heart rate surpasses fixed in advance value, 184 physiological phenomenon monitor units 2 will
Be used to the signal of pointing out main-scan condition to reset, with the signal elm of expression heart rate go out to
Condition of scanning selected cell 1.That is the heart rate inspection of 2 objects of excerpting of physiological phenomenon monitor unit,
Whether be necessary to reset main-scan condition.Notice that the variation of heart rate is as current heart rate
And the difference between the heart rate of when before injection of contrast agent, at first main-scan condition being set, quoting or
Rate of change calculates.
In case receive the letter that the prompting condition of scanning is reset from physiological phenomenon monitor unit 2
Number, condition of scanning selected cell 1 is judged living most with respect to the heart rate that receives with signal
Or the roughly best condition of scanning.In practice, condition of scanning selected cell 1 writes earlier from pausing
Depositing such as the semiconductor memory, disk or the magneto-optic disk that are had by data storage 6
Select the condition of scanning in the table in the storage media corresponding to this heart rate.
Shown in Fig. 2, for example, in this table, be provided with a plurality of relevant hearts rate (HR)
A plurality of parts, a plurality of distances (helical pitch) (HP) are closed with scanning speed and these parts
Connection.Referring to Fig. 2, in this table,, different distances and scanning speed close heart rate (HR) for being provided with
Different piece.Yet ' rate can be divided into plurality of sections in a part.Piao apart from be
Revolve the condition of using in the scanning of looking for of sweeping, and can be defined as volt when the x ray tube rotates a time
7 distances that move (millimeter) stop.Scanning speed can be defined as the X ray tube and rotate once institute
The time (second) that needs.
In this table, with more related than higher heart rate, vice versa than the high scanning speed of skill.
In addition, in this table, long pitch is with more related than higher heart rate, and vice versa.Logical
Cross this type of association, main-scan condition can so be reset, so that in advance: time of determining earlier
In in fixed in advance scanning 1 scope, finish main scanning (revolving scanning), the guarantor is at the ECG door
The quantity of the section that needs in the method for reconstructing, and prevent the undue reduction of temporal resolution.
Notice that except distance and scanning 1 speed, the condition of scanning also comprises sweep limits, can
With maximum scan time (sweeping the upper limit of finger time) of holding the breath, in ECG door reconstruction side
The sad little hop count that needs in the method, specific cardiac time phase place (prolonging from the R ripple in the electrocardio jail
Slow time), tube voltage, tube current, fragment degree, or the like.In these conditions of scanning,
Pitch and scanning speed are to the heart rate sensitivity.For example, if heartbeat is treated without proper respect, 160 hearts rate reduce,
Can not prepare the ECG door and rebuild needed section quantity, unless scanning speed reduces or distance
The Chinese catalpa, low.On the other hand, if scanning speed and low apart from undue battle array, then on sweep time
In the limit not; Ili obtains the fixed data for projection of thick first carbon in whole scanning 1 scope.On the contrary, take care to hold
Brisk, then heart rate increases, and can prepare the ECG door and rebuild required in short sweep time
Hop count, even scanning speed and Piao are apart from increase. in addition, can obtain whole pre-: earlier fixed
The skill shadow data of sweep limits.Plant and, the excessive increase of scanning speed and Piao distance is the time branch
The improvement of rate has kept the space.In above-mentioned table, determine distance and sweep with respect to heart rate normal incidence
Retouch speed, so that the such relation in flat street.
Turn around referring to Fig. 1 condition of scanning selected cell 1 selected main-scan condition again
Data pick out and be provided to scan control bun 3.This scanning monitor 3 is according to the condition of scanning that provides
The translational speed of the velocity of rotation of control X-ray tube and volt skill 7.For example, scan control ' 3
The rotating frame driver element of control stand 5 is so that rotating frame reached in just in the fixed in advance time
To the scanning speed that is provided with and keep this speed.Then, it is living that scanning draws the 3 drawing high voltages of raising
Become the unit, beginning filament heating, so that in merit in advance in the fixed time period to X-ray tube
Reach the temperature of corresponding valve current condition.Scanning 1 controller 3 also controls the X ray and stops list
Unit opens to adjust it according to the fragment thickness condition.Scanning monitor 3 further control volt is inserted
The orangutan moving cell, reaching speed in the predetermined time period corresponding to pitch, thus beginning
Mobile couch roll.
Fig. 3 has shown the process of the agglomerate tracking among this embodiment.Fig. 4 is that the field piece is followed
The time of track operation is uninterrupted sleep.Follow the tracks of the preparation of holding work under the arm as the field piece and hold work under the arm, physiological phenomenon measurement device 4
Begin to measure electrocardiogram (S1).This measurement continues to carry out always, up to injection of contrast agent and
After finishing in order, thick scanning finishes main scanning.
In prescan, the skill shadow data of object are by using more weak X ray continuous
Obtain the CT value that the position among the ROI is plain or represent the concentration of contrast medium among this ROI
Average CT value come under observation. in main sweeping, the projection number of object excerpt be thick scanning it
The X ray that relatively satisfy by use the back obtains.
Electrocardiograph 4 calculates heart rate according to the electrocardiogram of measuring. and main-scan condition is an armpit
Be provided with according to heart rate.And in real residual, heart rate is slightly different.Therefore, under the preferable case,
Heart rate is predetermined time width, for example, and putting down in the five seconds of the tight front of setting operation
Average, or look intermediate value in the fixed time degree of doting on of fixed carbon in advance, and according to this meansigma methods or in
Value is provided with main-scan condition.For convenience of description, suppose that main-scan condition is according to the heart rate setting
.Show with ECG data on display 8 by display controller 10 and to calculate
Heart rate.
The operator is by storing up referring to the electrocardio that shows and the heart is finally held under the arm as elm and gone into to pick out to do unit 9, so that
Elm goes into prescan condition, main-scan condition, and is used to carry out main scanning: the resetting of condition
The condition of resetting (S2).Notice that the value of regulation almost is many for the prescan condition
Order is determined.That is, be provided with following content: be provided with tube voltage and the tube current lower than hinge,
So that line irradiation in x village is suppressed to minimum, fragment degree of doting on, high scanning speed divides Yu with the increase time
Rate and a spot of reconstruction matrix are to improve substantivity. in addition, sweep finger position, contrast medium in advance
The concentration monitor area, carry out the transition to the condition (threshold value of contrast medium concentrations) of main scanning from prescan,
Or the like be manually to be provided with.
In addition, the numerous items of main-scan condition, for example, tube voltage, tube current, fragment
Degree, reconstruction hard iron battle array, and the field of view (FOV) that becomes social custom almost are according to checking purpose, object
Sex and physique or the like fixed.Sweep the scanning model that actual figure is excerpted and obtained by revolving therein
Enclose and be set to, for example, the scope in the whole zone of sundial lid heart.In addition, each patient can
The upper limit with time of holding the breath is unique, and is provided with in the ECG door method for reconstructing
Needed minimum hop count. apart from (HP) " and retouch speed " select list by the condition of scanning
Unit 1 is set to value corresponding to heart rate by the table in the reference data storage 6.Perhaps,
Go into these projects by the manual writing brush of the technical staff of becoming social custom.
The condition of resetting of resetting that is used to carry out main-scan condition is represented a rule,
The statement of this rule, when the main heart rate of sweeping the pendulum front, class when promptly prescan finishes or in real domain
Like the heart rate at time point place, the master is set from the preproduction phase of above-mentioned agglomerate tracking at first
Changes in heart rate during the condition of scanning is during to specific degrees, and the initial main-scan condition that is provided with should weigh
The main-scan condition of the heart rate when newly being set to corresponding to the thick end of scan.
For example, if heart rate is ' 60 in the table that shows among Fig. 2 when inner feelings just is provided with ",
Then this heart finally is included in the 0-70 in this table " part.Therefore, be provided with pitch in this part
HP?'o.9”。Yet, if thick: Z54 0-70 under the heart rate of measuring during the end of scan
Outside the part, the pitch HP corresponding to this heart rate should be set then.On the other hand, owing to annotate
The heart rate of penetrating contrast medium and changing may recover its normal value after the regular hour.
That is, even heart rate is in advance: alter a great deal during the end of scan, after this also may tend towards stability, and
Recover its normal value during main scanning.Show and suffer, in some cases, heart rate may keep changing value,
And can not recover its normal value.Changes in heart rate is different between different people.Therefore, doctor
Whether living or one-tenth actor technical staff should return to normal value by inspection-Cha heart rate when main scanning.
This judgement can be reflected in the condition of resetting.Doctor or imaging technique personnel can be at random
Be provided with when corresponding to the part of the heart rate of the tight front of main scanning from the heart rate when being provided with at first
Whether reset main-scan condition during the level of mobile specific quantity (step).
Go into to hold under the arm to do unit 9 when after above-mentioned initial being provided with finishes, pressing elm in time T 2
Start button the time, contrast medium is injected in the patient body automatically from penetrating the unit.From the injection
This contrast medium begins to carry out prescan after arriving the needed time of monitored position behind the contrast medium
(S3). promptly, at X-ray tube and X-ray detector at full speed with respect to localized fragment
When rotating continuously, generate low dose of x ray continuously, thereby obtain regularly around object
Fetch data.With prescan, figure takes care of yourself and builds the unit and scheme popular data from the reconstruction of skill shadow data in real time
(S2)。CT value cane in the relevant zone that sets in advance extracts from view data.This value
Or the meansigma methods of the CT value of a plurality of pixels of relevant range and the threshold value of transferring to main scanning are mutually
Ratio.The meansigma methods of this CT value or CT value is represented the concentration of the contrast medium in this relevant range.
Physiological phenomenon measurement device 4 continues the childlike innocence rate during this prescan.Shown in Fig. 7,
Heart rate shows (S4) with time diagram and numerical value.
Shown in Fig. 7, religion is quoted when sorrow just is provided with the condition of scanning heart rate and current heart rate
Show together.Initial scanning speed that is provided with and distance also show with numerical value.Emergency stop push button
With these a message slots～demonstration.The heart rate of the object of checking may be owing to injection of contrast agent
And so on influence and change suddenly.Under these circumstances, scheming popular technical staff can lead to
Cross and click emergency stop push button and carry out prescan and mainly sweep promptly stopping of looking for.
Mainly sweep Min value or the image technique personnel that pinch and manually press when the CT value arrive to shift to cut the throat
Main scanning is shifted when triggering the skill button (T3), and prescan stops (S5).Physiological phenomenon monitor unit 2
In the time period of the weak point before time T4, check the heart of when this thick end of scan, measuring
Rate changes whether satisfy the condition of resetting (S6) that main-scan condition is reset of carrying out.That is,
When at first the prescan condition being set, pick out heart rate of quoting and the heart rate of when prescan finishes, measuring
Between difference compare with the threshold value of resetting condition.
If the absolute value of this difference does not have to arrive the threshold value of the condition of resetting, l6q judges that heart rate becomes
Change whether enough little and discontented heavy sensation in the foot newly is provided with condition, and physiological phenomenon monitor unit 2 is to sweeping
Finger spare selected cell 1 sends and is used to point out the signal of resetting the upright condition of scanning.By this
Hold work under the arm, shown in Fig. 5, scan stripes equal's selected cell 1 sends initial to scanning monitor 3
The main-scan condition that is provided with or order this scanning monitor 3 at the initial main scanning bar that is provided with
Part starts setting down.Then, scanning monitor 3 is in the main-scan condition of the initial setting that sends
Start the setting (S7) of main scanning down in time T 4.Scanning monitor 3 time T 5 it
Before finish setting, and begin main sweeping in time T 5 and pinch (S8).When fully from whole scanning model
Enclose when obtaining data, scan control bun 3 stops main scanning (S9) in time T 6.
If in the step 56, judge the heart rate when at first the condition of scanning being set, be cited and
The absolute value of the difference between the heart leather of measuring when prescan finishes reaches the threshold of the condition of resetting
Value,! E4 judges that the variation of heart rate is greatly to satisfying the condition of resetting.Then, physiological phenomenon prison
Looking unit 2 sends one to condition of scanning selected cell 1 and is used for prompting and resets main scanning
The signal of condition, and be sent in the heart rate of sweeping measurement when looking for end in advance simultaneously. rub work by this,
Shown in Fig. 6, condition of scanning selected cell 1 is by the choosing of the table in the reference data storage device 6
Select the distance and the scanning speed of the heart rate when finishing corresponding to prescan, and with main-scan condition from
Initial Piao distance and the scanning speed that is provided with resets to selected pitch and scanning speed
(S1O)。
Pick out when resetting when distance and the speed of sweeping, show that control 10 is provided with initial
Pitch and scanning speed show pitch and the scanning speed of resetting together, shown in Fig. 8.
The image technique personnel can be according to whether showing distance and the scanning of resetting. and speed is discerned
Whether distance and scanning speed are reset.
When carrying out the scanning of ECG door, condition of scanning selected cell 1 is by tying prescan
Cardiac cycle during card (inverse of heart rate) multiply by the time from the R ripple to the special time phase place
The cardiac cycle of width when be set relevant time phase (special time phase place) recently heavy
Newly calculate time delay " from the R ripple to the special time phase place.
According to the above description, whether being necessary to reset main-scan condition is to be provided with according to initial
Difference between heart rate when heart rate during main-scan condition and prescan finish is judged, and main sweeping
The condition of retouching is that the heart rate when finishing according to prescan is reset.Yet, the present invention not only for
Heart rate when prescan finishes, the condition of scanning that whether is necessary to reset initial setting can
With according to any preset time finishing from start injection contrast medium or prescan to prescan
The heart rate that the some place is measured is judged.In addition, main-scan condition can according at this moment the section in
The heart rate that any preset time, the some place was measured is reset.Whether be necessary to reset main scanning
Condition is when finishing according to prescan,, approaches the heart rate of the time point that main scanning begins most that is
Judge. in addition, by resetting main-scan condition, main-scan condition can approach with
The best main-scan condition of the actual heart rate correspondence when carrying out main scanning.Perhaps, whether be necessary
The condition of scanning of resetting initial setting can be according to any preset time of the some place in this period
The heart rate of measuring is judged, resets main-scan condition then.Even in this example,
Main-scan condition can carried out under the initial main-scan condition that is provided with before the injection of contrast agent than working as
More approach above-mentioned optimum during main scanning.
Condition of scanning selected cell 1 sends the main scanning of resetting to scanning monitor 3
Condition.By this operation, scanning monitor 3 is provided with platform according to the main-scan condition of resetting
(S8、59)。
As indicated above, when heart rate changed, main-scan condition more particularly was a spiral shell
Distance and scanning speed are reset, and rebuild needed hop count not to solve such as the ECG door
Can fully prepare, and obtain in the sweep limits of whole plan in the upper limit of sweep time
The problem of data for projection and so on.In addition, this can improve temporal resolution.
If the step earth in Fig. 9 56 judges that changes in heart rate is enough big, satisfied and established again
The condition of putting, P! 4 display controllers 10 can make display 8 show this heart rate and disappear first
Breath, continuation/stop button is reset and reset to main-scan condition for confirmation, thereby
Confirm that at last whether being necessary to carry out main scanning resets operation (Sl6).If ordered not
Reset (Sl7), stand 5 and couch roll 7 is provided with according to going on foot 57 so
In the initial main-scan condition that is provided with and beginning, under this condition, carry out main scanning (S8,59).
If command execution is reset (Sl7), and in commonplace S1O of step, reset the main scanning bar
Part, then socks are hugged this condition setting stand 5 and volt light by 7 (S11).
Because can when finishing, prescan judge whether to be necessary to reset after holding work person's sorrow under the arm,
Therefore, even in the very short time period when finishing near prescan the heart rate change takes place temporarily
During the negligible mishap changed, also can avoid resetting the adverse effect of main-scan condition.
If heart rate changes excessively, that is, very rare situation takes place, for example, heart rate becomes
Change three or Pyatyi in the table, preferably, stopped main scanning in some cases.In order to handle
This type of situation is judged heart rate when physiological phenomenon monitor unit 2 and has been changed fixed in advance level
Rescue, for example, when three on table or Pyatyi, condition of scanning selected cell 1 can be so that display 8
Show message first, stop to continue/stop button to recognize main scanning, and show apparent with main scanning
The heart rate (Sl2) that work changes.Continue main scanning if rub work person (image technique personnel) order
(Sl3), I$4 according to the master that resets at step dish S1O and S11 of heart rate of significant change in this in the sixth of the twelve Earthly Branches
Carrying out main sweeping under the condition of scanning takes out.Stop main scanning (Sl3) if hold work person's order under the arm, then in the step
Transfer to the tight of main scanning by system controller or the execution of interlock circuit (not shown) among the earth Sl4
Suddenly stop.
Perhaps, shown in Figure 11, can manually reset main-scan condition.As Figure 12
Shown in, show that control 10 is with time diagram and numerical value and the elm of closing with main-scan condition
Go into the heart soldier of demonstration amount in the zone. go into the zone elm. in, shown initial setting the earth distance and
Scanning speed, with corresponding zone give a tongue-lashing shown on the drop-down menu that connects a plurality of candidate Piao distances and
A plurality of candidate's scanning speeds.In addition, sweep limits, satisfying main scanning can be fixed in advance
In fixed in advance sweep limits, finish following apart from ■ of this condition of main scanning in time period
Limit, object can shield the maximum time period of its breathing, that is, the upper limit of main scanning time is shown
Show.Scheming miserable technical staff holds under the arm as elm and goes into to hold under the arm to do following by reference scan scope, distance of unit 9
The upper limit of limit, main scanning time, and heart rate are selected pitch and scanning from corresponding candidate
Speed, thus the distance of resetting and scanning speed (Sl5) if. in the distance of selecting with sweep
Retouch under the condition of speed, in the fixed in advance time period in the sweep limits of determining earlier not
Can finish main scanning, maybe can not prepare the essential number of being lost, then show control earth 10 these feelings of judgement
Condition, and in a single day refusal is reset the condition of scanning that elm goes into when carrying out this selection.Show control
Degree.
Those skilled in the art can find easily other advantages go forward side by side the Xingqi he revise.Cause
This, the present invention is not limited only to the specific detailed letter that shows and introduce aspect widely herein its official
Breath and representative embodiment.Correspondingly, do not departing from being equal to of appended claim and they
Under the situation of the spirit and scope of total inventive concept of thing definition, can carry out various modifications.
Claims (9)
1. an x ray computer chromatography is picked out image device, and this device is by using the x more weak than hinge
Ray is carried out prescan obtaining the data of the object that has been injected into contrast medium, and prescan it
Main scanning is carried out to obtain the data of this object, this device by using more intense X ray in the back
Comprise:
One judging unit, this unit be configured to according to start injection contrast medium or prescan and
The data of the physiological phenomenon of the object of measuring in the period between prescan finishes have judged whether
Necessity is reset the condition of scanning of main scanning, this condition be at first according to injection of contrast agent it
The data of the physiological phenomenon of the preceding object of measuring are provided with; And
One scan condition setting unit, this unit are configured to be necessary heavily when judgment unit judges
When newly the condition of scanning being set, from the condition of scanning of initial setting again with the condition of scanning of main scanning
Be set to corresponding in the period between start injection contrast medium or prescan and prescan end
The condition of scanning of the data of the physiological phenomenon of the object of measuring.
2. according to the described device of claim 1, wherein, when judgment unit judges does not need heavily
When newly the condition of scanning being set, the condition of scanning is provided with the unit and keeps the initial condition of scanning that is provided with.
3. according to the described device of claim 1, wherein, the condition of scanning is provided with the unit basis and exists
The data of the physiological phenomenon of measuring when prescan finishes are reset the condition of scanning.
4. according to the described device of claim 1, wherein, the condition of scanning is provided with the unit and comprises and depositing
Reservoir, this memorizer are configured to store a table, this table in, a plurality of conditions of scanning with have
Close the multistage association of physiological phenomenon.
5. according to the described device of claim 1, wherein, the judging unit basis is at start injection
The physiological phenomenon of measuring in period between contrast medium or prescan and prescan finish with respect to
The intensity of variation of the physiological phenomenon of the object of measuring before the injection of contrast agent is judged to reset and is swept
Retouch the necessity of condition.
6. according to the described device of claim 1, wherein, it is right that the physiological phenomenon measurement device is measured
The heart rate of elephant.
7. according to the described device of claim 1, wherein, judging unit is according to tying at prescan
The data of the physiological phenomenon of measuring during card are judged the necessity of resetting the condition of scanning.
8. device according to claim 7, wherein, the condition of scanning is provided with the unit basis and exists
The data of the physiological phenomenon of measuring when prescan finishes are reset the condition of scanning.
Device according to claim 6, wherein, judging unit is according to pre-determining
Time width in the meansigma methods of heart rate or intermediate value judge the necessity of resetting the condition of scanning.
9. device according to claim 9, wherein, judging unit is average according to heart rate
Value or intermediate value are reset the condition of scanning.
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|---|---|---|---|
| CN2011100033711A CN102038515A (en) | 2011-01-10 | 2011-01-10 | X-ray computed tomography device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100033711A CN102038515A (en) | 2011-01-10 | 2011-01-10 | X-ray computed tomography device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061390A (en) * | 2014-02-21 | 2016-10-26 | 西门子医疗有限公司 | Method and device for recording medical images |
-
2011
- 2011-01-10 CN CN2011100033711A patent/CN102038515A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061390A (en) * | 2014-02-21 | 2016-10-26 | 西门子医疗有限公司 | Method and device for recording medical images |
| US11857356B2 (en) | 2014-02-21 | 2024-01-02 | Siemens Healthcare Gmbh | Method and device for recording medical images |
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