How can I covert a MBR to GPT partition map?

Mi imac don't restart after the 10.8.4 update, and the solution is reinstall OSX restoring the HD.
i'm using a external hard drive to clone the content of my HD, but its a MBR partition map, and it says that the process can only be done with a GPT partition map.
anyone who knows how to convert from a MBR to a GPT with a mac?
after converting the external HD, may i change again the partition map to his native MBR partition?
Many thanks.

Drive Partition and Format
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button.  When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
You can change the drive back to MBR by repartitioning it once again. Change GUID to MBR and the format to MSDOS on the Mac or do the same on a PC.

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