FI119620B - A method for performing digital mullet photography - Google Patents
A method for performing digital mullet photography Download PDFInfo
- Publication number
- FI119620B FI119620B FI981242A FI981242A FI119620B FI 119620 B FI119620 B FI 119620B FI 981242 A FI981242 A FI 981242A FI 981242 A FI981242 A FI 981242A FI 119620 B FI119620 B FI 119620B
- Authority
- FI
- Finland
- Prior art keywords
- radiation
- patient
- ray
- imaging
- digital
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 13
- 241001502129 Mullus Species 0.000 title description 8
- 230000005855 radiation Effects 0.000 claims description 23
- 210000004872 soft tissue Anatomy 0.000 claims description 13
- 238000003384 imaging method Methods 0.000 claims description 11
- 230000001678 irradiating effect Effects 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
- A61B6/51—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for dentistry
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
- A61B6/501—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for diagnosis of the head, e.g. neuroimaging or craniography
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
- G03B42/04—Holders for X-ray films
- G03B42/042—Holders for X-ray films for dental applications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
- H05G1/38—Exposure time
- H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
- H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medical Informatics (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Pathology (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Biophysics (AREA)
- High Energy & Nuclear Physics (AREA)
- Animal Behavior & Ethology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Dentistry (AREA)
- Radiology & Medical Imaging (AREA)
- Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Neurology (AREA)
- Neurosurgery (AREA)
- Toxicology (AREA)
- General Physics & Mathematics (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Description
Menetelmä digitaalisen kefalokuvauksen suorittamiseksiA method for performing digital mullet photography
Esillä olevan keksinnön kohteena on aikaansaada uusi, parannettu menetelmä kefalokuvien ottamiseksi.It is an object of the present invention to provide a new, improved method for taking mullet photographs.
55
Lateraalikefalokuvauksessa potilaan kallosta otetaan sivusuunnasta röntgenkuva. Nykyisin kefalokuvien ottamiseen käytetään yleisimmin tasanopeuksi-sia vahvistuslevyjä, sekä yleisimmin esim. muuttuvanopeuksista vahvistusle-vyä tai digitaalista kuvan käsittelyä, jolloin valotus suoritetaan normaalisti.In lateral mullet photography, a lateral X-ray of the patient's skull is taken. Nowadays, high-speed amplification discs are commonly used for taking mullet photographs, as well as variable-speed amplification discs or digital image processing, whereby exposure is normally performed.
10 Tällaisen menetelmän eräänä ongelmana on se, että säteilytaso ei ole optimaalinen potilaan kannalta. Potilaan ja säteilylähteen välissä on myös käytetty kiilan muotoista suodatinta valotustason säätämiseksi kefalokuvauksessa, kuten kuvattu esim. US-patenteissa US-4641336 ja US-5454023. Tällaisen ratkaisun eräänä ongelmana on suhteellisen monimutkainen mekaaninen 15 rakenne.One problem with such a method is that the radiation level is not optimal for the patient. A wedge-shaped filter has also been used between the patient and the radiation source to adjust the level of exposure in mullet photography, as described, for example, in U.S. Patent Nos. 4,641,336 and 5,454,403. One problem with such a solution is the relatively complicated mechanical structure.
Niinpä esillä olevan keksinnön päämääränä on aikaansaada suhteellisen yksinkertainen menetelmä kefalokuvien, erityisesti digitaalisten kefalokuvien ottamiseksi. Tämän päämäärän toteuttamiseksi keksinnön mukaiselle mene-20 telmälle on tunnusomaista se, että digitaalisen kefalokuvauksen menetelmässä säädetään automatisoidusti säteilytasoa perustuen kussakin kohdassa mitattuun potilaan läpäisseen säteilyn määrään siten, että säteilytasoa pudotetaan automatiikan ohjaamana pehmytkudosten alueella pehmytkudoksille sopivan säteilytason muodostamiseksi. Keksinnön mukaiselle menetelmälle 25 on myös tunnusomaista se, että digitaalisen kefalokuvauksen menetelmässä säädetään automatisoidusti säteilytasoa perustuen skannaavassa kuvausliik-keessä olevan säteilyä vastaanottavan detektorin kulloiseenkin asemaan potilaaseen nähden siten, että säteilytasoa pudotetaan automatiikan ohjaamana pehmytkudosten alueella pehmytkudoksille sopivan säteilytason muodosta-30 miseksi. Skannausliikkeessä säteilyn vastaanottava detektori liikkuu säteily-keilan mukana horisontaalisesti.Accordingly, it is an object of the present invention to provide a relatively simple method for taking mullet photographs, especially digital mullet films. To accomplish this goal, the method of the invention is characterized in that the digital multifilament imaging method automatically adjusts the radiation level based on the amount of radiation transmitted by the patient at each site so that the radiation level is automatically controlled to soft tissue level within the soft tissue area. The method 25 of the invention is also characterized in that the digital multifilament imaging method automatically adjusts the radiation level based on the current position of the radiation receiving detector in the scanning imaging motion relative to the patient, so that the radiation level is automatically lowered to soft tissue soft tissue. In the scanning motion, the radiation receiving detector moves horizontally along the radiation beam.
22
Keksinnön eräässä suoritusmuodossa säteilytasoa pudotetaan automatiikan ohjaamana pehmytkudosten alueella pehmytkudosten oikean valotustason saavuttamiseksi.In one embodiment of the invention, the level of radiation is automatically controlled in the area of soft tissues to achieve the correct level of exposure of the soft tissues.
5 Kuvausarvojen automaattinen säätäminen perustuu edullisesti potilaan läpäisseen säteilyn määrään. Digitaalikuvauksessa käytetään säteilyn vastaanottamiseen esim. CCD-sensoria tai CR-tekniikkaa.Preferably, the automatic adjustment of the acquisition values is based on the amount of radiation transmitted by the patient. Digital imaging uses, for example, a CCD sensor or CR technology to receive radiation.
Keksinnön mukaisen menetelmän eräänä tärkeänä etuna on se, että ns. late-10 raalikuvassa ei tarvita ylimääräistä suodatusta pehmytkudosten alueella, esim. suodatinkiilaa, koska skannattaessa kasvojen pehmytkudosten alueella voidaan automatiikan ohjaamana pudottaa säteilytasoa pehmytkudosten oikean valotustason saavuttamiseksi. Toisaalta automatiikan avulla kuvasta suoritettavien mittausten kannalta yhtä oleelliset mutta säteilyä huonommin 15 läpäisevät luustoalueet voidaan valottaa suuremmalla tasolla.An important advantage of the method according to the invention is that the so-called. the late-10 catheter does not require extra filtering in the soft tissue area, such as a filter wedge, because when scanning in the soft tissue area of the face, the radiation level can be lowered automatically to achieve the correct exposure of the soft tissue. On the other hand, bone areas that are equally essential but less transmissive to radiation can be exposed at a higher level for automated image measurements.
Lisäksi keksinnön mukaisen menetelmän avulla teknisessä mielessä vaikeasti hallittava kuvauksen suuri dynamiikkavaatimus (pieni valotustaso pehmytkudokselle ja suuri luukudoksille) voidaan "pilkkoa" ajallisesti ja paikallisesti se-20 kä ratkaista ongelma täten osissa. Nykyisiin tunnettuihin kuvankäsittelymene-telmiin verrattuna, joissa kuvan dynamiikkaa joudutaan edellä mainituista syistä muokkaamaan, on keksinnön eräänä etuna potilaan sädeannoksen pieneneminen.In addition, the high dynamic imaging requirement (low level of exposure to soft tissue and high bone tissue) difficult to control in the technical sense of the invention can be "chopped" over time and locally and thus solve the problem in parts. Compared to the current known image processing methods, where the image dynamics have to be modified for the above reasons, one advantage of the invention is the reduction of the radiation dose to the patient.
25 Suodatuskiilaa käyttävään ratkaisuun verrattuna etuna on mm. mekaanisten rakenteiden huomattava väheneminen, asennussäädön jääminen pois sekä epälineaarisen suodatuksen mahdollisuus.25 An advantage compared to a solution using a filter wedge is eg. a significant reduction in mechanical structures, no adjustment of installation, and the possibility of non-linear filtration.
Säteilytystason automaattiseen säätöön voidaan käyttää useaa mitattavaa 30 suuretta yhdessä tai erikseen; esim. läpäisseen säteilyn määrää, skannaavan säteilydetektorin asemaa potilaaseen nähden ja potilaan asetteluvälineiden 3 paikkaa. Säätökäyrän muodolla on myös vähemmän rajoituksia kuin ennestään tunnetuilla toteutustavoilla.For the automatic adjustment of the irradiation level, a plurality of 30 measurable quantities can be used together or separately; e.g., the amount of radiation transmitted, the position of the scanning radiation detector relative to the patient, and the 3 positions of the patient positioning means. The shape of the control curve also has fewer limitations than prior art embodiments.
Claims (5)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI981242A FI119620B (en) | 1998-06-02 | 1998-06-02 | A method for performing digital mullet photography |
PCT/FI1999/000471 WO1999062404A1 (en) | 1998-06-02 | 1999-06-01 | Method for producing cephalo exposures |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI981242A FI119620B (en) | 1998-06-02 | 1998-06-02 | A method for performing digital mullet photography |
FI981242 | 1998-06-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
FI981242A0 FI981242A0 (en) | 1998-06-02 |
FI981242A FI981242A (en) | 1999-12-03 |
FI119620B true FI119620B (en) | 2009-01-30 |
Family
ID=8551878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI981242A FI119620B (en) | 1998-06-02 | 1998-06-02 | A method for performing digital mullet photography |
Country Status (2)
Country | Link |
---|---|
FI (1) | FI119620B (en) |
WO (1) | WO1999062404A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3808442A (en) * | 1971-08-21 | 1974-04-30 | F Poggio | Apparatus for carrying out cranium radiographs and teleradiographs according to a plurality of projections |
FI92974C (en) * | 1992-06-12 | 1995-02-10 | Orion Yhtymae Oy | A method for capturing an object with a panoramic device equipped with automatic exposure |
FI103176B (en) * | 1993-06-15 | 1999-05-14 | Planmeca Oy | Soft tissue filter device for cephalostat |
FI100296B (en) * | 1995-12-14 | 1997-11-14 | Instrumentarium Corp | Automatic exposure of the X-ray machine |
-
1998
- 1998-06-02 FI FI981242A patent/FI119620B/en not_active IP Right Cessation
-
1999
- 1999-06-01 WO PCT/FI1999/000471 patent/WO1999062404A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO1999062404A1 (en) | 1999-12-09 |
FI981242A0 (en) | 1998-06-02 |
FI981242A (en) | 1999-12-03 |
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Owner name: PALODEX GROUP OY Free format text: PALODEX GROUP OY |
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MM | Patent lapsed |